chore(deps): update dessant/lock-threads action to v6

.github/workflows/lock-threads.yml

@@ -23,7 +23,7 @@ jobs:
     if: github.repository == 'spantaleev/matrix-docker-ansible-deploy'
     runs-on: ubuntu-latest
     steps:
-      - uses: dessant/lock-threads@v5
+      - uses: dessant/lock-threads@v6
         with:
           add-issue-labels: 'outdated'
           process-only: 'issues, prs'