getheaders is deprecated in urllib3 >= 2.0.0

[mvalenzisi]

Please remove the deprecated function getheaders from client/rest.py

What happened (please include outputs or screenshots):

Traceback (most recent call last):
  File "/home/mau/repos/project-automation/k8s/k8s.py", line 828, in <module>
    main()
  File "/home/mau/repos/project-automation/k8s/k8s.py", line 803, in main
    k8s_project.create_namespace()
  File "/home/mau/repos/project-automation/k8s/k8s.py", line 110, in create_namespace
    self.__k8s_cluster.create_namespace(
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/pja_sdk/k8s.py", line 98, in create_namespace
    namespace = self.__corev1api.create_namespace(body=body)
                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/kubernetes/client/api/core_v1_api.py", line 6363, in create_namespace
    return self.create_namespace_with_http_info(body, **kwargs)  # noqa: E501
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/kubernetes/client/api/core_v1_api.py", line 6454, in create_namespace_with_http_info
    return self.api_client.call_api(
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/kubernetes/client/api_client.py", line 348, in call_api
    return self.__call_api(resource_path, method,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/kubernetes/client/api_client.py", line 180, in __call_api
    response_data = self.request(
                    ^^^^^^^^^^^^^
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/kubernetes/client/api_client.py", line 391, in request
    return self.rest_client.POST(url,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/kubernetes/client/rest.py", line 279, in POST
    return self.request("POST", url,
           ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/kubernetes/client/rest.py", line 238, in request
    raise ApiException(http_resp=r)
          ^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/kubernetes/client/exceptions.py", line 91, in __init__
    self.headers = http_resp.getheaders()
                   ^^^^^^^^^^^^^^^^^^^^^^
  File "/home/mau/.virtualenvs/project-automation-2/lib/python3.12/site-packages/kubernetes/client/rest.py", line 44, in getheaders
    return self.urllib3_response.getheaders()
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
AttributeError: 'HTTPResponse' object has no attribute 'getheaders'. Did you mean: 'headers'?

How to reproduce it (as minimally and precisely as possible):
Install requirements (urllib3 >= 2.0.0) and call any function.

Environment:

• Kubernetes version (kubectl version): v1.29.5
• OS (e.g., MacOS 10.13.6): Linux
• Python version (python --version) 3.12.3
• Python client version (pip list | grep kubernetes) 29.0.0