Add bot to lock inactive closed issues and pull requests

Close #9237.

.github/workflows/lock.yml

@@ -0,0 +1,18 @@
+name: 'Lock old threads'
+
+on:
+  schedule:
+    - cron: '0 0 * * *'
+
+permissions:
+  issues: write
+  pull-requests: write
+
+jobs:
+  action:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: dessant/lock-threads@v2
+        with:
+          issue-lock-inactive-days: '30'
+          pr-lock-inactive-days: '30'