[Bug] Update Mac App Store submission documentation

[spartygw]

https://www.electronjs.org/docs/latest/tutorial/mac-app-store-submission-guide#upload

References "Application Loader" for submitting to Mac App Store. Apple no longer supports Application Loader and it's no longer part of Xcode.

[gabi200]

I made a PR addressing this issue: #35116

[github-actions]

This issue has been automatically marked as stale. If this issue is still affecting you, please leave any comment (for example, "bump"), and we'll keep it open. If you have any new additional information—in particular, if this is still reproducible in the latest version of Electron or in the beta—please include it with your comment!