Update urllib3 requirements

[fwong03]

@npilon noticed this: OpenAPITools/openapi-generator#20845

This is causing problems when working with other packages that have urllib3 requirements below 2.1.0. When comparing to requirements with this python client, it seems like it should work, but it doesn't. You get this error:

  File "/.../site-packages/urllib3/poolmanager.py", line 125, in _default_key_normalizer
    return key_class(**context)
           ^^^^^^^^^^^^^^^^^^^^
TypeError: PoolKey.__new__() got an unexpected keyword argument 'key_ca_cert_data'