Update cargo/rls submodules and dependencies

[alexcrichton]

Brings in a few regression fixes on the Cargo side, updates the rls to work
with the newer Cargo, and also updates other crates.io dependencies to pull in
various bug fixes and such.

[rust-highfive]

r? @aturon

(rust_highfive has picked a reviewer for you, use r? to override)

[alexcrichton]

This is a reopening of #42668 but with more updates

r? @Mark-Simulacrum

[Mark-Simulacrum]

Looks good to me.

@bors r+

[bors]

📌 Commit 34abff9 has been approved by Mark-Simulacrum

[bors]

⌛ Testing commit 34abff9 with merge daf08a7...

[bors]

💔 Test failed - status-appveyor

[Mark-Simulacrum]

[01:06:58] error[E0432]: unresolved import `cargo::core::MultiShell`
[01:06:58] --> src\tools\rls\src\build.rs:19:30
[01:06:58] |
[01:06:58] 19 | use cargo::core::{PackageId, MultiShell, Workspace};
[01:06:58] | ^^^^^^^^^^ no `MultiShell` in `core`
[01:06:58]
[01:06:59] error: aborting due to previous error(s)

[alexcrichton]

@bors: r=Mark-Simulacrum

[bors]

📌 Commit 1cede10 has been approved by Mark-Simulacrum

[bors]

⌛ Testing commit 1cede10 with merge 10d7cb4...

[bors]

☀️ Test successful - status-appveyor, status-travis
Approved by: Mark-Simulacrum
Pushing 10d7cb4 to master...