Update stale.yml

Author: rez1dent3

.github/workflows/stale.yml

@@ -13,4 +13,4 @@ jobs:
         days-before-stale: 5
         days-before-close: 7
         exempt-issue-labels: 'bug'
-        exempt-pr-labels: 'bug,frozen'
+        exempt-pr-labels: 'bug,frozen,10.x-dev'