Update "Close inactive issues" workflow to close issues after 180 days of inactivity (github#909)

* update PR_DAYS_BEFORE_STALE

* update to mark as stale after 60 days

Author: tommaso-moro

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

@@ -8,7 +8,7 @@ jobs:
     runs-on: ubuntu-latest
     env:
       PR_DAYS_BEFORE_STALE: 60
-      PR_DAYS_BEFORE_CLOSE: 10
+      PR_DAYS_BEFORE_CLOSE: 120
       PR_STALE_LABEL: stale
     permissions:
       issues: write