Merge pull request #4051 from moreal/ci-toolchain-1.63.0

Update CI toolchain to stable

.github/workflows/ci.yaml

@@ -263,7 +263,7 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - uses: dtolnay/rust-toolchain@1.62.1
+      - uses: dtolnay/rust-toolchain@stable
         with:
             components: rustfmt, clippy
       - name: run rustfmt