chore: updated cron job to 4am UTC (#21501)

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## **Description**

Updated cron job to run at 4am UTC.

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## **Related issues**

Fixes:

## **Manual testing steps**

```gherkin
Feature: my feature name

  Scenario: user [verb for user action]
    Given [describe expected initial app state]

    When user [verb for user action]
    Then [describe expected outcome]
```

## **Screenshots/Recordings**

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### **After**

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## **Pre-merge author checklist**

- [ ] I’ve followed [MetaMask Contributor
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## **Pre-merge reviewer checklist**

- [ ] I've manually tested the PR (e.g. pull and build branch, run the
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- [ ] I confirm that this PR addresses all acceptance criteria described
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<!-- CURSOR_SUMMARY -->
---

> [!NOTE]
> Update nightly GitHub Actions workflow to run at 04:00 UTC instead of
23:00.
> 
> <sup>Written by [Cursor
Bugbot](https://cursor.com/dashboard?tab=bugbot) for commit
081d4d9. This will update automatically
on new commits. Configure
[here](https://cursor.com/dashboard?tab=bugbot).</sup>
<!-- /CURSOR_SUMMARY -->

Author: sethkfman

.github/workflows/nightly-temp-branch-sync.yml

@@ -6,9 +6,9 @@ permissions:
 
 on:
   schedule:
-    # Run at 11 PM UTC daily (adjust timezone as needed)
+    # Run at 4 AM UTC
     # NOTE: Scheduled workflows ALWAYS run from the default branch (main)
-    - cron: '0 23 * * *'
+    - cron: '0 4 * * *'
 
   # Allow manual trigger for testing from ANY branch
   workflow_dispatch: