Bump dtolnay/rust-toolchain in the ci-dependencies group

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


Updates `dtolnay/rust-toolchain` from 21dc36fb71dd22e3317045c0c31a3f4249868b17 to 7b1c307e0dcbda6122208f10795a713336a9b35a
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@21dc36f...7b1c307)

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

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

Author: dependabot[bot]

.github/workflows/check.yml

@@ -27,7 +27,7 @@ jobs:
         run: npm ci
         working-directory: frontend
       - name: Install rust toolchain
-        uses: dtolnay/rust-toolchain@21dc36fb71dd22e3317045c0c31a3f4249868b17
+        uses: dtolnay/rust-toolchain@7b1c307e0dcbda6122208f10795a713336a9b35a
         with:
           toolchain: "stable"
       - name: Rust cache

.github/workflows/publish.yml

@@ -23,7 +23,7 @@ jobs:
         run: npm ci
         working-directory: frontend
       - name: Install toolchain
-        uses: dtolnay/rust-toolchain@21dc36fb71dd22e3317045c0c31a3f4249868b17
+        uses: dtolnay/rust-toolchain@7b1c307e0dcbda6122208f10795a713336a9b35a
         with:
           toolchain: "stable"
       - name: Rust cache