Update stale message for pull requests

Author: danadajian

.github/workflows/stale.yml

@@ -10,7 +10,7 @@ jobs:
     steps:
       - uses: actions/stale@v10
         with:
-          stale-issue-message: 'This issue is stale because it has been open 30 days with no activity. Remove stale label or comment or this will be closed in 5 days.'
+          stale-pr-message: 'This issue is stale because it has been open 7 days with no activity. Remove stale label or comment or this will be closed in 7 days.'
           days-before-pr-stale: 7
           days-before-pr-close: 7
           days-before-issue-stale: -1