chore: stale bot - increase # of days for issues

[skip ci]
diff --git a/.github/stale.yml b/.github/stale.yml
index 1c2dcf3..fbf6447 100644
--- a/.github/stale.yml
+++ b/.github/stale.yml
@@ -25,7 +25,7 @@
     ready. Thank you for contributing.
 
 issues:
-  daysUntilStale: 60
+  daysUntilStale: 90
   daysUntilClose: 7
   exemptLabels:
     - valid