chore(deps): bump dtolnay/rust-toolchain (#19)

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from 3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 to 67ef31d5b988238dd797d409d6f9574278e20537.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@3c5f7ea...67ef31d)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: 67ef31d5b988238dd797d409d6f9574278e20537
  dependency-type: direct:production
...

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Author: dependabot[bot]

.github/workflows/test.yml

@@ -187,7 +187,7 @@ jobs:
     steps:
       - uses: actions/checkout@v7
 
-      - uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9
+      - uses: dtolnay/rust-toolchain@67ef31d5b988238dd797d409d6f9574278e20537
         with:
           toolchain: ${{ needs.msrv-meta.outputs.msrv }}