Update the stale bot config

.github/stale.yml

@@ -5,7 +5,7 @@ daysUntilStale: 30
 
 # Number of days of inactivity before an Issue or Pull Request with the stale label is closed.
 # Set to false to disable. If disabled, issues still need to be closed manually, but will remain marked as stale.
-daysUntilClose: 7
+daysUntilClose: 15
 
 # Only issues or pull requests with all of these labels are check if stale. Defaults to `[]` (disabled)
 onlyLabels: []
@@ -13,6 +13,7 @@ onlyLabels: []
 # Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
 exemptLabels:
   - "high priority"
+  - "pinned"
 
 # Set to true to ignore issues in a project (defaults to false)
 exemptProjects: false