chore: relax stale issue timings (#5735)

We received customer feedback that our stale issue timings are too tight.
This brings issue timings into line with other AWS SDK teams.

Author: kellertk

.github/workflows/stale_issues.yml

@@ -29,7 +29,7 @@ jobs:
         closed-for-staleness-label: closed-for-staleness
 
         # Issue timing
-        days-before-stale: 7
+        days-before-stale: 10
         days-before-close: 4
         days-before-ancient: 365