build(deps): bump dtolnay/rust-toolchain from f7ccc83 to stable (#1226)

These hash bumps just add noise to the repo. The usage here is non-sensitive.

Author: dependabot[bot]

.github/workflows/mutation-testing.yml

@@ -53,7 +53,7 @@ jobs:
           persist-credentials: false
           submodules: recursive
 
-      - uses: dtolnay/rust-toolchain@f7ccc83f9ed1e5b9c81d8a67d7ad1a747e22a561  # stable
+      - uses: dtolnay/rust-toolchain@stable
         with:
           toolchain: stable