Update close_stale_issues.yml

Fixing error in label specification

.github/workflows/close_stale_issues.yml

@@ -14,6 +14,6 @@ jobs:
           days-before-stale: 60
           days-before-close: 30
           operations-per-run: 1000
-          exempt-issue-labels: 'enhancement','Work in progress','Planned'
+          exempt-issue-labels: 'enhancement, Work in progress, Planned'
           days-before-pr-stale: -1
           days-before-pr-close: -1