build(deps): bump dessant/lock-threads from 5.0.1 to 6.0.0 (#14808)

Bumps [dessant/lock-threads](https://github.com/dessant/lock-threads) from 5.0.1 to 6.0.0.
- [Release notes](https://github.com/dessant/lock-threads/releases)
- [Changelog](https://github.com/dessant/lock-threads/blob/main/CHANGELOG.md)
- [Commits](dessant/lock-threads@1bf7ec2...7266a7c)

---
updated-dependencies:
- dependency-name: dessant/lock-threads
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

.github/workflows/lock.yml

@@ -11,7 +11,7 @@ jobs:
   action:
     runs-on: ${{ vars.LINKERD2_RUNNER || 'ubuntu-24.04' }}
     steps:
-      - uses: dessant/lock-threads@1bf7ec25051fe7c00bdd17e6a7cf3d7bfb7dc771
+      - uses: dessant/lock-threads@7266a7ce5c1df01b1c6db85bf8cd86c737dadbe7
         with:
           issue-inactive-days: "30"
           process-only: "issues"