ci: bump dtolnay/rust-toolchain

Bumps [dtolnay/rust-toolchain](https://github.com/dtolnay/rust-toolchain) from fa04a1451ff1842e2626ccb99004d0195b455a88 to 2c7215f132e9ebf062739d9130488b56d53c060c.
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@fa04a14...2c7215f)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: 2c7215f132e9ebf062739d9130488b56d53c060c
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

.github/workflows/panic-attack.yml

@@ -35,7 +35,7 @@ jobs:
         with:
           persist-credentials: false
       - name: Install Rust toolchain (stable)
-        uses: dtolnay/rust-toolchain@fa04a1451ff1842e2626ccb99004d0195b455a88 # stable
+        uses: dtolnay/rust-toolchain@2c7215f132e9ebf062739d9130488b56d53c060c # stable
         with:
           toolchain: stable
       - name: Install panic-attacker