chore(deps): update dtolnay/rust-toolchain digest to a54c7af

Author: renovate[bot]

.github/workflows/ci.yml

@@ -30,7 +30,7 @@ jobs:
           submodules: recursive
 
       - name: 🧰 Install MSRV toolchain
-        uses: dtolnay/rust-toolchain@1482605bfc5719782e1267fd0c0cc350fe7646b8 # v1
+        uses: dtolnay/rust-toolchain@a54c7afa936fefeb4456b2dd8068152669aa8203 # v1
         with:
           toolchain: ${{ env.MSRV }}