grr_api_client to Werkzeug 2.x

**Environment**

Using the API client from a custom Flask application.

**Describe the issue**
Using grr_api_client in a Flask 2.x application results in versioning conflicts, as grr_api_client depends on a relatively old version of Werkzeug:

https://github.com/google/grr/blob/66026dfcfe6cb329868e5271f44825531fe87b62/api_client/python/setup.py#L68

Could we update grr_api_client to Werkzeug 2.x?

**Additional context**
Add any other context about the problem here.