chore: prevent stalebot to issues flagged as bug (#408)

Author: Belco90

.github/stale.yml

@@ -6,6 +6,7 @@ daysUntilClose: 7
 exemptLabels:
   - pinned
   - security
+  - bug
 # Label to use when marking an issue as stale
 staleLabel: wontfix
 # Comment to post when marking an issue as stale. Set to `false` to disable