Bump dtolnay/rust-toolchain from 2c7215f132e9ebf062739d9130488b56d53c060c to 6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772 in the github-actions group (#1880)

Bump dtolnay/rust-toolchain in the github-actions group

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


Updates `dtolnay/rust-toolchain` from 2c7215f132e9ebf062739d9130488b56d53c060c to 6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772
- [Release notes](https://github.com/dtolnay/rust-toolchain/releases)
- [Commits](dtolnay/rust-toolchain@2c7215f...6c977a6)

---
updated-dependencies:
- dependency-name: dtolnay/rust-toolchain
  dependency-version: 6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772
  dependency-type: direct:production
  dependency-group: github-actions
...

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

Author: dependabot[bot]

.github/workflows/sync-clarity-reference.yml

@@ -36,7 +36,7 @@ jobs:
           path: stacks-core
 
       - name: Install Rust toolchain
-        uses: dtolnay/rust-toolchain@2c7215f132e9ebf062739d9130488b56d53c060c # master
+        uses: dtolnay/rust-toolchain@6c977a6ca4077a0ceb28ffbe03f59d46e9ac8772 # master
         with:
           toolchain: stable