Bump Kani Version

[zhassan-aws]

These are the automatically-generated release notes:

## What's Changed
* Toolchain upgrade to nightly-2025-05-04 by @thanhnguyen-aws in https://github.com/model-checking/kani/pull/4059
* Automatic toolchain upgrade to nightly-2025-05-05 by @github-actions in https://github.com/model-checking/kani/pull/4060
* Automatic toolchain upgrade to nightly-2025-05-06 by @github-actions in https://github.com/model-checking/kani/pull/4061
* Enable target features: x87 and sse2 by @thanhnguyen-aws in https://github.com/model-checking/kani/pull/4062
* Fix the bug: Loop contracts are not composable with function contracts by @thanhnguyen-aws in https://github.com/model-checking/kani/pull/3979
* Automatic cargo update to 2025-05-12 by @github-actions in https://github.com/model-checking/kani/pull/4066
* Bump tests/perf/s2n-quic from `6aa9975` to `5f323b7` by @dependabot in https://github.com/model-checking/kani/pull/4068
* Fix stabilization instructions in RFC intro by @carolynzech in https://github.com/model-checking/kani/pull/4067
* Add support for quantifiers by @qinheping in https://github.com/model-checking/kani/pull/3993
* Toolchain upgrade to nightly-2025-05-07 by @thanhnguyen-aws in https://github.com/model-checking/kani/pull/4070
* Automatic toolchain upgrade to nightly-2025-05-08 by @github-actions in https://github.com/model-checking/kani/pull/4071
* Automatic toolchain upgrade to nightly-2025-05-09 by @github-actions in https://github.com/model-checking/kani/pull/4072
* Automatic toolchain upgrade to nightly-2025-05-10 by @github-actions in https://github.com/model-checking/kani/pull/4073
* Clippy/Stylistic Fixes by @carolynzech in https://github.com/model-checking/kani/pull/4074
* Upgrade toolchain to 2025-05-14 by @zhassan-aws in https://github.com/model-checking/kani/pull/4076
* Autoharness argument validation: only error on `--quiet` if `--list` was passed by @carolynzech in https://github.com/model-checking/kani/pull/4069
* Upgrade Rust toolchain to 2025-05-16 by @zhassan-aws in https://github.com/model-checking/kani/pull/4080
* Automatic toolchain upgrade to nightly-2025-05-17 by @github-actions in https://github.com/model-checking/kani/pull/4081
* Add setup scripts for Ubuntu 20.04 by @zhassan-aws in https://github.com/model-checking/kani/pull/4082
* Automatic toolchain upgrade to nightly-2025-05-18 by @github-actions in https://github.com/model-checking/kani/pull/4083
* Automatic cargo update to 2025-05-19 by @github-actions in https://github.com/model-checking/kani/pull/4086
* Automatic toolchain upgrade to nightly-2025-05-19 by @github-actions in https://github.com/model-checking/kani/pull/4085
* Automatic toolchain upgrade to nightly-2025-05-20 by @github-actions in https://github.com/model-checking/kani/pull/4091
* Bump tests/perf/s2n-quic from `5f323b7` to `22434aa` by @dependabot in https://github.com/model-checking/kani/pull/4089
* Fix the error that Kani panics when there is no external parameter in quantifier's closure. by @thanhnguyen-aws in https://github.com/model-checking/kani/pull/4088
* Update toolchain to 2025-05-22 by @carolynzech in https://github.com/model-checking/kani/pull/4098
* Use our toolchain when invoking `cargo metadata` by @carolynzech in https://github.com/model-checking/kani/pull/4090
* Automatic toolchain upgrade to nightly-2025-05-23 by @github-actions in https://github.com/model-checking/kani/pull/4099
* Automatic toolchain upgrade to nightly-2025-05-24 by @github-actions in https://github.com/model-checking/kani/pull/4101
* Automatic toolchain upgrade to nightly-2025-05-25 by @github-actions in https://github.com/model-checking/kani/pull/4102
* Fix a bug codegening `SwitchInt`s with only an otherwise branch by @bkirwi in https://github.com/model-checking/kani/pull/4095
* Automatic toolchain upgrade to nightly-2025-05-26 by @github-actions in https://github.com/model-checking/kani/pull/4104
* Automatic cargo update to 2025-05-26 by @github-actions in https://github.com/model-checking/kani/pull/4105
* Bump tests/perf/s2n-quic from `22434aa` to `550afb3` by @dependabot in https://github.com/model-checking/kani/pull/4106
* Automatic toolchain upgrade to nightly-2025-05-27 by @github-actions in https://github.com/model-checking/kani/pull/4107
* Update `kani::mem` pointer validity documentation by @carolynzech in https://github.com/model-checking/kani/pull/4092
* Add support for edition 2018 crates using assert! (Fixes #3717) by @sintemal in https://github.com/model-checking/kani/pull/4096
* Automatic toolchain upgrade to nightly-2025-05-28 by @github-actions in https://github.com/model-checking/kani/pull/4113
* Automatic toolchain upgrade to nightly-2025-05-29 by @github-actions in https://github.com/model-checking/kani/pull/4115
* Automatic toolchain upgrade to nightly-2025-05-30 by @github-actions in https://github.com/model-checking/kani/pull/4118
* Handle generic defaults in BoundedArbitrary derives by @zhassan-aws in https://github.com/model-checking/kani/pull/4117
* Automatic cargo update to 2025-06-02 by @github-actions in https://github.com/model-checking/kani/pull/4121
* Bump tests/perf/s2n-quic from `550afb3` to `8f54b57` by @dependabot in https://github.com/model-checking/kani/pull/4122
* Upgrade Rust toolchain to 2025-06-02 by @zhassan-aws in https://github.com/model-checking/kani/pull/4123
* Automatic toolchain upgrade to nightly-2025-06-03 by @github-actions in https://github.com/model-checking/kani/pull/4125
* Finish deprecating `--enable-unstable`, `--restrict-vtable`, and `--write-json-symtab` by @carolynzech in https://github.com/model-checking/kani/pull/4110
* `ty_mangled_name`: only use non-mangled name if `-Zcffi` is enabled. by @carolynzech in https://github.com/model-checking/kani/pull/4114
* Improve Help Menu by @carolynzech in https://github.com/model-checking/kani/pull/4109
* Start stabilizing `--jobs` and `list`; deprecate default memory checks by @carolynzech in https://github.com/model-checking/kani/pull/4108
* Refactor simd_bitmask to reduce the number of iterations by @zhassan-aws in https://github.com/model-checking/kani/pull/4129
* Set target features depending on the target architecture by @zhassan-aws in https://github.com/model-checking/kani/pull/4127
* Bump some versions suggested by cargo-outdated by @zhassan-aws in https://github.com/model-checking/kani/pull/4131
* Improve linking error output for `#[no_std]` crates by @AlexanderPortland in https://github.com/model-checking/kani/pull/4126
* Fix the git log command in the toolchain update script by @zhassan-aws in https://github.com/model-checking/kani/pull/4139
* Gate quantifiers behind an experimental feature by @thanhnguyen-aws in https://github.com/model-checking/kani/pull/4141
* Automatic cargo update to 2025-06-09 by @github-actions in https://github.com/model-checking/kani/pull/4145
## New Contributors
* @bkirwi made their first contribution in https://github.com/model-checking/kani/pull/4095
* @sintemal made their first contribution in https://github.com/model-checking/kani/pull/4096
* @AlexanderPortland made their first contribution in https://github.com/model-checking/kani/pull/4126
**Full Changelog**: https://github.com/model-checking/kani/compare/kani-0.62.0...kani-0.63.0

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 and MIT licenses.

[carolynzech]

Nit: the "What's Changed" section is rather large this time, so it'd be nice to try to group them somewhat: all the autoharness ones listed together, the loop invariant ones, etc. Not a huge deal though, take or leave. I made some other suggestions in the name of trying to group similar PRs together.

[zhassan-aws]

Nit: the "What's Changed" section is rather large this time, so it'd be nice to try to group them somewhat: all the autoharness ones listed together, the loop invariant ones, etc. Not a huge deal though, take or leave. I made some other suggestions in the name of trying to group similar PRs together.

Good call out. Done.