Ignore common PR labels

Author: Garulf

.github/workflows/stale.yml

@@ -23,3 +23,4 @@ jobs:
           close-issue-message: 'This issue was closed because it has been stale for 5 days with no activity. If you feel this issue still needs attention please feel free to reopen.'
           stale-pr-label: 'no-pr-activity'
           exempt-issue-labels: 'keep-fresh'
+          exempt-pr-labels: 'keep-fresh,awaiting-approval,work-in-progress'