add "good-first-issue" to stalebot exemption list [ci skip]

Signed-off-by: Christopher Hiller <boneskull@boneskull.com>

Author: boneskull

.github/stale.yml

@@ -25,6 +25,7 @@ exemptLabels:
   - reporter
   - common-mistake
   - developer-experience
+  - good-first-issue
 # Label to use when marking an issue as stale
 staleLabel: stale
 # Comment to post when marking an issue as stale. Set to `false` to disable