chore(deps): bump dtolnay/rust-toolchain

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from 56f84321dbccf38fb67ce29ab63e4754056677e0 to 3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@56f8432...3c5f7ea)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: 3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/mirror.yml

@@ -127,7 +127,7 @@ jobs:
           fetch-depth: 0
 
       - name: Setup Rust
-        uses: dtolnay/rust-toolchain@56f84321dbccf38fb67ce29ab63e4754056677e0 # stable
+        uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # stable
         with:
           toolchain: stable