Increase default retention period for workflow runs to 30 days

Author: CrazyBoy49z

.github/workflows/delete-workflows.yml

@@ -5,7 +5,7 @@ on:
       days:
         description: 'Days-worth of runs to keep for each workflow'
         required: true
-        default: '10'
+        default: '30'
       minimum_runs:
         description: 'Minimum runs to keep for each workflow'
         required: true