Rust workflow startup failure: the action dtolnay/rust-toolchain@stable is not allowed in apache/sedona-spatialbench

[jbampton]

Workflow failure seen here:

https://github.com/apache/sedona-spatialbench/actions/runs/27225860697

We have:

- uses: dtolnay/rust-toolchain@stable

We need to pin to sha and use:

https://github.com/apache/infrastructure-actions/blob/437608c5893288af177de21bb7e7b735a548ee26/approved_patterns.yml#L162