Windows check currently failing on main

[stes]

See e.g. https://github.com/AdaptiveMotorControlLab/CEBRA/actions/runs/17514468814

[stes]

Issue here is

    def test_continuous_no_legend():
        embedding = np.random.uniform(0, 1, (1000, 3))
        labels = np.random.uniform(0, 1, (1000,))
    
>       fig = cebra_plotly.plot_embedding_interactive(embedding, labels)

tests\test_plotly.py:106: 
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
cebra\integrations\plotly.py:228: in plot_embedding_interactive
    return _EmbeddingInteractivePlot(
cebra\integrations\plotly.py:58: in __init__
    super().__init__(**kwargs)
cebra\integrations\matplotlib.py:271: in __init__
    super().__init__(axis, figsize, dpi)
cebra\integrations\matplotlib.py:69: in __init__
    self.fig = plt.figure(figsize=figsize, dpi=dpi)
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\site-packages\matplotlib\pyplot.py:1042: in figure
    manager = new_figure_manager(
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\site-packages\matplotlib\pyplot.py:552: in new_figure_manager
    return _get_backend_mod().new_figure_manager(*args, **kwargs)
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\site-packages\matplotlib\backend_bases.py:3504: in new_figure_manager
    return cls.new_figure_manager_given_figure(num, fig)
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\site-packages\matplotlib\backend_bases.py:3509: in new_figure_manager_given_figure
    return cls.FigureCanvas.new_manager(figure, num)
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\site-packages\matplotlib\backend_bases.py:1785: in new_manager
    return cls.manager_class.create_with_canvas(cls, figure, num)
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\site-packages\matplotlib\backends\_backend_tk.py:535: in create_with_canvas
    window = tk.Tk(className="matplotlib")

Which can probably be fixed by using the agg backend or sth similar for plotly when running plotly and matplotlib tests.

There are several other warning messages related to these tests which could be addressed in the same run.