Exclude some labels from stale

Exclude certain labels from having their issues marked as stale.

Author: martincostello

.github/workflows/stale.yml

@@ -20,6 +20,7 @@ jobs:
         with:
           days-before-close: 14
           days-before-stale: 60
+          exempt-issue-labels: 'ANNOUNCEMENT,up-for-grabs,v8'
           stale-issue-label: 'stale'
           stale-issue-message: "This issue is stale because it has been open for 60 days with no activity. It will be automatically closed in 14 days if no further updates are made."
           close-issue-message: "This issue was closed because it has been inactive for 14 days since being marked as stale."