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

Author: renovate[bot]

.github/workflows/lock.yml

@@ -16,7 +16,7 @@ jobs:
   action:
     runs-on: ubuntu-latest
     steps:
-      - uses: dessant/lock-threads@v5
+      - uses: dessant/lock-threads@v6
         with:
           github-token: ${{ github.token }}
           issue-inactive-days: '14'