Recover gracefully from git 429 rate-limits on overleaf

[j6k4m8]

Right now it crashes the server, which is probably not the ideal user experience.

This line in the refresh (called from the constructor) is the offender:

llm4papers/llm4papers/paper_remote/OverleafGitPaperRemote.py

Line 92 in af7a108

self._repo = Repo.clone_from(self._gitrepo, f"/tmp/{self._reposlug}")