update stale bot (#4769)

Co-authored-by: chaton <[email protected]>

Author: Borda

.github/stale.yml

@@ -40,3 +40,10 @@ pulls:
 staleLabel: "won't fix"
 # Limit the number of actions per hour, from 1-30. Default is 30
 limitPerRun: 10
+
+# Set to true to ignore issues in a project (defaults to false)
+exemptProjects: true
+# Set to true to ignore issues in a milestone (defaults to false)
+exemptMilestones: true
+# Set to true to ignore issues with an assignee (defaults to false)
+exemptAssignees: true