Bump dtolnay/rust-toolchain

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from b3b07ba8b418998c39fb20f53e8b695cdcc8de1b to e97e2d8cc328f1b50210efc529dca0028893a2d9.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@b3b07ba...e97e2d8)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: e97e2d8cc328f1b50210efc529dca0028893a2d9
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

.github/workflows/ci.yaml

@@ -81,7 +81,7 @@ jobs:
           repository: 'nginx/nginx-tests'
           path: 'nginx/tests'
 
-      - uses: dtolnay/rust-toolchain@b3b07ba8b418998c39fb20f53e8b695cdcc8de1b
+      - uses: dtolnay/rust-toolchain@e97e2d8cc328f1b50210efc529dca0028893a2d9
         with:
           toolchain: ${{ matrix.rust-version }}
           components: clippy, rustfmt