format.yml CI flow: use a 3rd party action to setup rust

Author: nunoplopes

.github/workflows/format.yml

@@ -17,10 +17,11 @@ jobs:
         with:
           llvm-version: 22
 
-      - name: Install Rust toolchain
-        run: |
-          curl --proto '=https' --tlsv1.2 -sSf https://sh.rustup.rs | sh -s -- -y --default-toolchain 1.94.0
-          echo "$HOME/.cargo/bin" >> $GITHUB_PATH
+      - name: Setup Rust
+        uses: dtolnay/rust-toolchain@master
+        with:
+          toolchain: 1.94.0
+          components: rustfmt
 
       - name: Check C++ formatting
         run: find cpp2rust tests -name '*.cpp' -o -name '*.h' -o -name '*.c' | xargs clang-format --dry-run --Werror