Running tests with Sphinx 9+ fails, sphinx.testing.path has been removed, affecting conftest.py

[befeleme]

+ /usr/bin/pytest -v --deselect tests/test_options.py::test_list_of_three_icons_automated_values
ImportError while loading conftest '/builddir/build/BUILD/python-sphinx-favicon-1.0.1-build/sphinx-favicon-1.0.1/tests/conftest.py'.
tests/conftest.py:5: in <module>
    from sphinx.testing.path import path
E   ModuleNotFoundError: No module named 'sphinx.testing.path'

Running tests with Sphinx 9+ fails, sphinx.testing.path has been removed.

[tcmetzger]

@befeleme Thanks for flagging this! This seems to related to updates in newer Sphinx versions - and there are definitely a few more things that need updating. I have started PR #56 to address several of those issues, please feel free to chime in if you have the time!