Check for stale PRs less frequently. (#4)

Author: yaphott

.github/workflows/stale-pr.yml

@@ -2,7 +2,7 @@ name: "Stale PRs"
 on:
   schedule:
     # * is a special character in YAML so you have to quote this string
-    - cron: "0 0 * * *"
+    - cron: "0 0 * * 3"
 
 permissions:
   contents: read