Some unit test cases are broken with requests-mock >= 1.12.0

The following unit tests are failing with similar tracebacks since requests-mock was bumped to 1.12.1 .

 - glanceclient.tests.unit.test_shell.ShellTestRequests.test_download_has_no_stray_output_to_stdout
 - glanceclient.tests.unit.test_shell.ShellTestRequests.test_v2_download_has_no_stray_output_to_stdout
 - glanceclient.tests.unit.test_shell.ShellTestRequests.test_v1_download_has_no_stray_output_to_stdout

```
glanceclient.tests.unit.test_shell.ShellTestRequests.test_download_has_no_stray_output_to_stdout
------------------------------------------------------------------------------------------------

Captured traceback:
~~~~~~~~~~~~~~~~~~~
    Traceback (most recent call last):
      File "/home/tkajinam/git/openstack/python-glanceclient/glanceclient/tests/unit/test_shell.py", line 912, in test_download_has_no_stray_output_to_stdout
    shell.main(argstr.split())
      File "/home/tkajinam/git/openstack/python-glanceclient/glanceclient/shell.py", line 588, in main
    args.func(client, args)
      File "/home/tkajinam/git/openstack/python-glanceclient/glanceclient/v1/shell.py", line 163, in do_image_download
    body = image.data()
           ^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/glanceclient/v1/images.py", line 55, in data
    return self.manager.data(self, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/glanceclient/v1/images.py", line 146, in data
    resp, body = self.client.get('/v1/images/%s'
                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/glanceclient/common/http.py", line 318, in get
    return self._request('GET', url, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/glanceclient/common/http.py", line 272, in _request
    resp = self.session.request(method,
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/.tox/py3/lib/python3.11/site-packages/requests/sessions.py", line 589, in request
    resp = self.send(prep, **send_kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/.tox/py3/lib/python3.11/site-packages/requests_mock/mocker.py", line 185, in _fake_send
    return _original_send(session, request, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/.tox/py3/lib/python3.11/site-packages/requests/sessions.py", line 703, in send
    r = adapter.send(request, **kwargs)
        ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/.tox/py3/lib/python3.11/site-packages/requests_mock/adapter.py", line 248, in send
    resp = matcher(request)
           ^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/.tox/py3/lib/python3.11/site-packages/requests_mock/adapter.py", line 228, in __call__
    return response_matcher.get_response(request)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/.tox/py3/lib/python3.11/site-packages/requests_mock/response.py", line 268, in get_response
    return create_response(request,
           ^^^^^^^^^^^^^^^^^^^^^^^^
      File "/home/tkajinam/git/openstack/python-glanceclient/.tox/py3/lib/python3.11/site-packages/requests_mock/response.py", line 205, in create_response
    _extract_cookies(request, response, kwargs.get('cookies'))
      File "/home/tkajinam/git/openstack/python-glanceclient/.tox/py3/lib/python3.11/site-packages/requests_mock/response.py", line 103, in _extract_cookies
    response.cookies.extract_cookies(MockResponse(response.raw.headers),
      File "/usr/lib64/python3.11/http/cookiejar.py", line 1685, in extract_cookies
    for cookie in self.make_cookies(response, request):
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
      File "/usr/lib64/python3.11/http/cookiejar.py", line 1603, in make_cookies
    rfc2965_hdrs = headers.get_all("Set-Cookie2", [])
                   ^^^^^^^^^^^^^^^
    AttributeError: 'dict' object has no attribute 'get_all'

```

The failure is not reporoduced when requests-mock is pinned to 1.11.0, and I suspect the issue is caused by the following change in requests-mock.

https://github.com/jamielennox/requests-mock/commit/e3bd0d1a92e40fa9cb1d587c59157020a45de620