Bump dessant/lock-threads from 2.0.3 to 2.1.1

Bumps [dessant/lock-threads](https://github.com/dessant/lock-threads) from 2.0.3 to 2.1.1.
- [Release notes](https://github.com/dessant/lock-threads/releases)
- [Changelog](https://github.com/dessant/lock-threads/blob/master/CHANGELOG.md)
- [Commits](https://github.com/dessant/lock-threads/compare/v2.0.3...v2.1.1)

---
updated-dependencies:
- dependency-name: dessant/lock-threads
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

.github/workflows/autolock.yaml

@@ -11,7 +11,7 @@ jobs:
   lock:
     runs-on: ubuntu-20.04
     steps:
-      - uses: dessant/lock-threads@v2.0.3
+      - uses: dessant/lock-threads@v2.1.1
         with:
           github-token: ${{ github.token }}
           # Lock down after 3 months.