support rate limits for git clone

[andboss]

We have many repositories that are cloned in parallel and sometimes receiving HTTP code 429 from GitLab server:

File "/usr/local/lib/python3.11/asyncio/runners.py", line 118, in run
    return self._loop.run_until_complete(task)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/asyncio/base_events.py", line 653, in run_until_complete
    return future.result()
           ^^^^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/mkdocs_multirepo_plugin/structure.py", line 424, in batch_import
    await batch_execute(
  File "/usr/local/lib/python3.11/site-packages/mkdocs_multirepo_plugin/structure.py", line 416, in batch_execute
    repo = await future
           ^^^^^^^^^^^^
  File "/usr/local/lib/python3.11/asyncio/tasks.py", line 615, in _wait_for_one
    return f.result()  # May raise f.exception().
           ^^^^^^^^^^
  File "/usr/local/lib/python3.11/site-packages/mkdocs_multirepo_plugin/structure.py", line 388, in import_docs
    await self.sparse_clone([self.docs_dir, self.config] + self.extra_imports)
  File "/usr/local/lib/python3.11/site-packages/mkdocs_multirepo_plugin/structure.py", line 193, in sparse_clone
    await execute_bash_script("sparse_clone.sh", args, self.temp_dir)
  File "/usr/local/lib/python3.11/site-packages/mkdocs_multirepo_plugin/util.py", line 106, in execute_bash_script
    raise BashException(f"\n{stderr}\n")
mkdocs_multirepo_plugin.util.BashException: 
Cloning into 'apps/my-app'...
warning: redirecting to https://my-gitlab/my-app/docs.git/
remote: 429 - Too many requests, see: my-gitlab/settings/#rate-limits
fatal: unable to access 'my-gitlab/my-app/docs/': The requested URL returned error: 429
fatal: could not fetch 44f30c194a684634f2[249](https://my-gitlab/documentation/user-doc/-/jobs/167841352#L249)6040e7d8b8dd9ba1625 from promisor remote
warning: Clone succeeded, but checkout failed.
You can inspect what was checked out with 'git status'
and retry with 'git restore --source=HEAD :/'

Is it possible to react on rate limits? Or add a config option to wait (sleep) in between clone executions?