update requirements for unittest-xml

[FilMar]

Hi, i tried to launch the test with python 3.12 and i receive this error:
Traceback (most recent call last):

  File "/home/fildev/git_projects/dj-rest-auth/runtests.py", line 26, in <module>
    runtests()
  File "/home/fildev/git_projects/dj-rest-auth/runtests.py", line 17, in runtests
    TestRunner = get_runner(settings)
                 ^^^^^^^^^^^^^^^^^^^^
  File "/home/fildev/git_projects/dj-rest-auth/.venv/lib/python3.12/site-packages/django/test/utils.py", line 380, in get_runner
    test_module = __import__(test_module_name, {}, {}, test_path[-1])
                  ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/home/fildev/git_projects/dj-rest-auth/.venv/lib/python3.12/site-packages/xmlrunner/__init__.py", line 11, in <module>
    from .runner import XMLTestRunner
  File "/home/fildev/git_projects/dj-rest-auth/.venv/lib/python3.12/site-packages/xmlrunner/runner.py", line 6, in <module>
    from .unittest import TextTestRunner, TestProgram
  File "/home/fildev/git_projects/dj-rest-auth/.venv/lib/python3.12/site-packages/xmlrunner/unittest.py", line 8, in <module>
    from unittest import TestResult, _TextTestResult
ImportError: cannot import name '_TextTestResult' from 'unittest' (/usr/lib/python3.12/unittest/__init__.py). Did you mean: 'TextTestResult'?

so i read the file /usr/lib/python3.12/unittest/init.py and how it's changed in the history and _TextTestResult is deprecated, from 3.12 it's removed. upgrade unittest-xml-reporting to latest version resolve the problem and tests work, i also added python 3.12 to list of test on workflow.

I'm sorry if i wrong something, this is my first contribution on github on a public project