Bump dessant/lock-threads from 5 to 6 (#2554)

[deploy site]

Author: dependabot[bot]

.github/workflows/lock.yml

@@ -14,7 +14,7 @@ jobs:
   action:
     runs-on: ubuntu-latest
     steps:
-      - uses: dessant/lock-threads@v5
+      - uses: dessant/lock-threads@v6
         with:
           process-only: 'issues'
           issue-lock-inactive-days: '30'