Update stale PR workflow

.github/workflows/stale.yml

@@ -1,5 +1,5 @@
 
-# This workflow warns and then closes  PRs that have had no activity for a specified amount of time.
+# This workflow warns and then closes PRs that have had no activity for a specified amount of time.
 #
 # You can adjust the behavior by modifying this file.
 # For more information, see:
@@ -8,15 +8,15 @@ name: Mark stale pull requests
 
 on:
   schedule:
-  - cron: '30 23 * * *'
+  - cron: '30 23 */4 * *'
 
 jobs:
   stale:
     runs-on: ubuntu-latest
     permissions:
       issues: write
       pull-requests: write
-      
+
     steps:
       - uses: actions/stale@v8
         with:
@@ -25,4 +25,3 @@ jobs:
           close-pr-message: 'This PR was closed because it has been stalled for 7 days with no activity.'
           days-before-pr-stale: 30
           days-before-pr-close: 7
-