Update .github/workflows/benchmark.yml

Author: utpilla

.github/workflows/benchmark.yml

@@ -41,7 +41,7 @@ jobs:
       - uses: arduino/setup-protoc@c65c819552d16ad3c9b72d9dfd5ba5237b9c906b # v3.0.0
         with:
           repo-token: ${{ secrets.GITHUB_TOKEN }}
-      - uses: dtolnay/rust-toolchain@56f84321dbccf38fb67ce29ab63e4754056677e0 # master
+      - uses: dtolnay/rust-toolchain@56f84321dbccf38fb67ce29ab63e4754056677e0
         with:
           toolchain: stable
       - uses: boa-dev/criterion-compare-action@adfd3a94634fe2041ce5613eb7df09d247555b87 # v3.2.4