chore(deps): update dtolnay/rust-toolchain digest to 7c8d7d1

Author: renovate[bot]

.github/workflows/ci.yml

@@ -74,7 +74,7 @@ jobs:
           submodules: recursive
 
       - name: 🧰 Install Rust toolchain
-        uses: dtolnay/rust-toolchain@4fd1da8b0805d2d2e936788875a7d65dbd677dc2 # nightly
+        uses: dtolnay/rust-toolchain@7c8d7d138f5c09cef361f8214cf96882cd029cdb # nightly
         with:
           target: ${{ matrix.target }}
           components: rust-src, rustfmt, clippy