Bump dessant/lock-threads from 4.0.1 to 5.0.0

Bumps [dessant/lock-threads](https://github.com/dessant/lock-threads) from 4.0.1 to 5.0.0.
- [Release notes](https://github.com/dessant/lock-threads/releases)
- [Changelog](https://github.com/dessant/lock-threads/blob/main/CHANGELOG.md)
- [Commits](dessant/lock-threads@be8aa5b...d42e5f4)

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

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

.github/workflows/lock.yaml

@@ -18,7 +18,7 @@ jobs:
     runs-on: ubuntu-latest
     if: ${{ github.repository == 'flutter/flutter' }}
     steps:
-      - uses: dessant/lock-threads@be8aa5be94131386884a6da4189effda9b14aa21
+      - uses: dessant/lock-threads@d42e5f49803f3c4e14ffee0378e31481265dda22
         with:
           process-only: 'issues'
           github-token: ${{ github.token }}