Bump dtolnay/rust-toolchain

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from d8352f6b1d2e870bc5716e7a6d9b65c4cc244a1a to a54c7afa936fefeb4456b2dd8068152669aa8203.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](d8352f6b1d...a54c7afa93)

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

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

.github/workflows/ci.yml

@@ -35,7 +35,7 @@ jobs:
       - name: Install ${{ steps.gettoolchain.outputs.toolchain }} Rust toolchain
         # Latest version available on this commit is 1.71.1
         # Commit date is Aug 3, 2023
-        uses: dtolnay/rust-toolchain@d8352f6b1d2e870bc5716e7a6d9b65c4cc244a1a
+        uses: dtolnay/rust-toolchain@a54c7afa936fefeb4456b2dd8068152669aa8203
         with:
           toolchain: ${{ steps.gettoolchain.outputs.toolchain }}