Use latest stable Rust CI

Signed-off-by: Michael X. Grey <[email protected]>

Author: mxgrey

.github/workflows/rust.yml

@@ -51,7 +51,7 @@ jobs:
         use-ros2-testing: ${{ matrix.ros_distribution == 'rolling' }}
 
     - name: Setup Rust
-      uses: dtolnay/rust-toolchain@1.74.0
+      uses: dtolnay/rust-toolchain@stable
       with:
         components: clippy, rustfmt