Git clone retry

[Karina5005]

Cloning into bare repository 'llvm-project.git'...
error: index-pack died of signal 9
fatal: index-pack failed
Traceback (most recent call last):
  File "/usr/local/bin/backup-github", line 8, in <module>
    sys.exit(main())
  File "/usr/local/lib/python3.8/dist-packages/backup_github/main.py", line 36, in main
    backup.backup_repositories()
  File "/usr/local/lib/python3.8/dist-packages/backup_github/backup.py", line 66, in backup_repositories
    self.__save_repositories(self.repositories, repo_dir)
  File "/usr/local/lib/python3.8/dist-packages/backup_github/backup.py", line 75, in __save_repositories
    self.__save_repo_content(repository, dir)
  File "/usr/local/lib/python3.8/dist-packages/backup_github/backup.py", line 107, in __save_repo_content
    os.chdir(f"{repository}.git")
FileNotFoundError: [Errno 2] No such file or directory: 'llvm-project.git'