Update dtolnay/rust-toolchain digest to 6d653ac

.github/workflows/main.yaml

@@ -11,10 +11,10 @@ jobs:
     timeout-minutes: 5
     steps:
     - name: Checkout repository
-      uses: actions/checkout@v5
+      uses: actions/checkout@v4
 
     - name: Setup rust
-      uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b
+      uses: dtolnay/rust-toolchain@6d653acede28d24f02e3cd41383119e8b1b35921
       id: toolchain
       with:
         toolchain: stable