chore(deps): bump dtolnay/rust-toolchain from 3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 to 67ef31d5b988238dd797d409d6f9574278e20537 in the actions group (#309)

Bumps the actions group with 1 update:
[dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain).

Updates `dtolnay/rust-toolchain` from
3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 to
67ef31d5b988238dd797d409d6f9574278e20537
<details>
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<li><a
href="https://github.com/dtolnay/rust-toolchain/commit/67ef31d5b988238dd797d409d6f9574278e20537"><code>67ef31d</code></a>
Update actions/checkout@v6 -&gt; v7</li>
<li>See full diff in <a
href="https://github.com/dtolnay/rust-toolchain/compare/3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9...67ef31d5b988238dd797d409d6f9574278e20537">compare
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.github/workflows/panicbot-sweep.yml

@@ -41,7 +41,7 @@ jobs:
         uses: actions/checkout@9c091bb21b7c1c1d1991bb908d89e4e9dddfe3e0 # v7.0.0
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@3c5f7ea28cd621ae0bf5283f0e981fb97b8a7af9 # stable
+        uses: dtolnay/rust-toolchain@67ef31d5b988238dd797d409d6f9574278e20537 # stable
         with:
           toolchain: stable