update stale issue tracker to not auto-close feature requests (#650)

Author: ianbotsf

.github/workflows/stale_issue.yaml

@@ -29,7 +29,7 @@ jobs:
 
         # These labels are required
         stale-issue-label: closing-soon
-        exempt-issue-labels: no-auto-closure
+        exempt-issue-labels: no-auto-closure,feature-request
         stale-pr-label: closing-soon
         exempt-pr-labels: pr/needs-review
         response-requested-label: response-requested