HDDS-14107. Update instructions for reopening closed stale PRs (#9758)

Author: ptlrs

.github/workflows/close-stale-prs.yaml

@@ -35,4 +35,4 @@ jobs:
           remove-pr-stale-when-updated: true
           operations-per-run: 500
           stale-pr-message: 'This PR has been marked as stale due to 21 days of inactivity. Please comment or remove the stale label to keep it open. Otherwise, it will be automatically closed in 7 days.'
-          close-pr-message: 'Thank you for your contribution. This PR is being closed due to inactivity. If needed, feel free to reopen it.'
+          close-pr-message: 'Thank you for your contribution. This PR is being closed due to inactivity. Please contact a maintainer if you would like to reopen it.'