Increase stale PR timer from 15 to 30 days

.github/workflows/close-stale-issues.yml

@@ -43,7 +43,7 @@ jobs:
           # Pull request parameters
           close-pr-message: >
             This PR has been automatically closed due to lack of activity.
-          days-before-pr-stale: 15
+          days-before-pr-stale: 30
           days-before-pr-close: 15
           exempt-pr-labels: 'status: blocked'
           stale-pr-label: 'pending closure'