chore: bump Mattraks/delete-workflow-runs from 2.0.6 to 2.1.0 (#135)

Bumps [Mattraks/delete-workflow-runs](https://github.com/mattraks/delete-workflow-runs) from 2.0.6 to 2.1.0.
- [Release notes](https://github.com/mattraks/delete-workflow-runs/releases)
- [Commits](Mattraks/delete-workflow-runs@39f0bbe...01b6589)

---
updated-dependencies:
- dependency-name: Mattraks/delete-workflow-runs
  dependency-version: 2.1.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

.github/workflows/delete-old-workflow-runs.yml

@@ -54,7 +54,7 @@ jobs:
     steps:
       - name: Delete workflow runs
         # Use specific commit SHA of action to ensure consistent behaviour across executions.
-        uses: Mattraks/delete-workflow-runs@39f0bbed25d76b34de5594dceab824811479e5de # v2.0.6
+        uses: Mattraks/delete-workflow-runs@01b65895d680fc9900871fd63cb37caf1a58567c # v2.1.0
         with:
           token: ${{ secrets.GITHUB_TOKEN }}
           repository: ${{ github.repository }}