Merge pull request #2402 from filecoin-project/fix/update-versions-cron

change update versions workflow to a cron job

Author: lanzafame

.github/workflows/update-versions.yml

@@ -1,9 +1,10 @@
 name: Update Lotus Version
 
 on:
+  schedule:
+    # Run every 2 days at 03:47 UTC
+    - cron: '47 3 */2 * *'
   workflow_dispatch:
-  pull_request:
-    types: [opened, reopened]
 
 jobs:
   update-version:
@@ -38,4 +39,4 @@ jobs:
             This PR was automatically generated by GitHub Actions.
           branch: update-lotus-version
           base: main
-          delete-branch: true
+          delete-branch: true