Overleaf Git integration returns 403 Forbidden (Overleaf likely blocked Free tier access)

[LimFang]

Hi ,

Thanks for creating this awesome tool! I was really excited to use it to keep my GitHub repo and Overleaf in sync without touching the UI. However, I'm consistently running into a 403 Forbidden error during the Action execution.

It seems Overleaf might have recently tightened their API access restrictions, completely blocking Git integration for Free tier accounts.

Steps to reproduce:

1. Followed the setup guide and ran the Python script.
2. Successfully added OVERLEAF_PROJECT_ID and OVERLEAF_GIT_TOKEN to GitHub Secrets.
3. Triggered the workflow (either manually or via push).

Error Log (from GitHub Actions):

Fetching latest from Overleaf...
fatal: unable to access 'https://git.overleaf.com/698c3d413afa04f00b56b7c5/': The requested URL returned error: 403