Bump dtolnay/rust-toolchain (#2273)

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from d8352f6b1d2e870bc5716e7a6d9b65c4cc244a1a to 7b1c307e0dcbda6122208f10795a713336a9b35a.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@d8352f6...7b1c307)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

.github/workflows/examples.yml

@@ -42,7 +42,7 @@ jobs:
 
       - name: Install toolchain
         id: toolchain
-        uses: dtolnay/rust-toolchain@d8352f6b1d2e870bc5716e7a6d9b65c4cc244a1a # Master branch, Rust up to 1.74.1
+        uses: dtolnay/rust-toolchain@7b1c307e0dcbda6122208f10795a713336a9b35a # Master branch, Rust up to 1.74.1
         with:
           toolchain: ${{ matrix.toolchain }}
           components: rust-src