run lockbot more often, close after 30 days (#4894)

.github/workflows/lock.yml

 
 on:
   schedule:
-    - cron: '0 0 * * *'
+    - cron: '0 0/4 * * *'
 
 jobs:
   lock:
         with:
           github-token: ${{ github.token }}
-          issue-lock-inactive-days: '365'
+          issue-lock-inactive-days: '30'
           issue-exclude-created-before: ''
           issue-exclude-labels: ''
           issue-lock-labels: ''