chore: set stale to 30 days instead of 60

.github/workflows/stale.yml

@@ -20,7 +20,7 @@ jobs:
         with:
           start-date: 2021-02-01
 
-          days-before-stale: 60
+          days-before-stale: 30
           days-before-issue-close: 7
           days-before-pr-close: 14