Adjust stale cron (#1264)

.github/workflows/lock.yml

@@ -2,7 +2,7 @@ name: 'Lock Threads'
 
 on:
   schedule:
-    - cron: '15 1 * * *'
+    - cron: '15 1/3 * * *'
 
 jobs:
   lock:

.github/workflows/stale.yml

@@ -1,7 +1,7 @@
 name: 'Close stale issues and PRs'
 on:
   schedule:
-    - cron: '50 1 * * *'
+    - cron: '50 1/3 * * *'
 
 jobs:
   stale: