chore: Update stale.yml

reduce `daysUntilStale` & `daysUntilClose` to keep the contributors active.
diff --git a/.github/stale.yml b/.github/stale.yml
index dabc66eb..9322ae8 100644
--- a/.github/stale.yml
+++ b/.github/stale.yml
@@ -1,11 +1,11 @@
 # Configuration for probot-stale - https://github.com/probot/stale
 
 # Number of days of inactivity before an Issue or Pull Request becomes stale
-daysUntilStale: 30
+daysUntilStale: 15
 
 # Number of days of inactivity before a stale Issue or Pull Request 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: 3
 
 # Issues or Pull Requests with these labels will never be considered stale. Set to `[]` to disable
 exemptLabels: