Update Python versions in PR monitor workflow

Author: kaustubhharapanahalli

.github/workflows/pr-monitor.yml

@@ -13,7 +13,7 @@ jobs:
       contents: read
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11"]
+        python-version: ["3.11", "3.12"]
 
     steps:
       - name: Checkout code