remove matplotlib.docstring

[samwaseda]

@jan-janssen informed me that matplotlib.docstring is deprecated.

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[samwaseda]

I don't really understand why the tests are failing...

[jan-janssen]

======================================================================
ERROR: test_takes_scalar_field (test_mesh.TestDecorators)
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Traceback (most recent call last):
  File "/home/runner/work/pyiron_continuum/pyiron_continuum/tests/unit/test_mesh.py", line 56, in test_takes_scalar_field
    self.assertRaises(TypeError, method, self.mesh, "not even numeric")  # Duh
  File "/usr/share/miniconda3/envs/test/lib/python3.10/unittest/case.py", line 738, in assertRaises
    return context.handle('assertRaises', args, kwargs)
  File "/usr/share/miniconda3/envs/test/lib/python3.10/unittest/case.py", line 201, in handle
    callable_obj(*args, **kwargs)
  File "/home/runner/work/pyiron_continuum/pyiron_continuum/pyiron_continuum/mesh.py", line 39, in wrapper
    if np.all(scalar_field.shape == self.divisions):
ValueError: operands could not be broadcast together with shapes (3,) (0,) 

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[jan-janssen]

@liamhuber Can you take a look art this issue? It seems to be related to the RectMesh class. Currently this issue blocks the update of the docker containers pyiron/docker-stacks#131 which are required for the MaterialDigital project.