seaborn-* styles are deprecated

[QuLogic]

The seaborn-whitegrid style used in this package was renamed and deprecated in Matplotlib 3.6 The upcoming Matplotlib 3.8 release has removed the deprecated names and will cause this package to fail to import, e.g.,

______________ ERROR collecting tests/test_area_identification.py ______________
/usr/lib64/python3.12/site-packages/matplotlib/style/core.py:137: in use
    style = _rc_params_in_file(style)
/usr/lib64/python3.12/site-packages/matplotlib/__init__.py:869: in _rc_params_in_file
    with _open_file_or_url(fname) as fd:
/usr/lib64/python3.12/contextlib.py:137: in __enter__
    return next(self.gen)
/usr/lib64/python3.12/site-packages/matplotlib/__init__.py:846: in _open_file_or_url
    with open(fname, encoding='utf-8') as f:
E   FileNotFoundError: [Errno 2] No such file or directory: 'seaborn-whitegrid'

The above exception was the direct cause of the following exception:
tests/test_area_identification.py:6: in <module>
    from sport_activities_features.area_identification import AreaIdentification
sport_activities_features/__init__.py:18: in <module>
    from sport_activities_features.plot_data import PlotData
sport_activities_features/plot_data.py:3: in <module>
    plt.style.use('seaborn-whitegrid')
/usr/lib64/python3.12/site-packages/matplotlib/style/core.py:139: in use
    raise OSError(
E   OSError: 'seaborn-whitegrid' is not a valid package style, path of style file, URL of style file, or library style name (library styles are listed in `style.available`)

[firefly-cpp]

Thanks @QuLogic. What do you think is the best replacement?

[QuLogic]

That depends on which versions you want to support. For Matplotlib 3.6 and above, use the styles with the seaborn-v0_8 prefix. Otherwise, you'll have to do a version check.