Handle warnings from tests and remove ipykernel and fsspec pins

[hoxbro]

• The nested array warning is coming from here, so it can safely be ignored
  

  holoviews/holoviews/core/data/spatialpandas.py

  Lines 903 to 906 in 8d3a745

  	try:
  	return np.asarray(v)
  	except ValueError:
  	return np.asarray(v, dtype=object)

• The unpin of ipykernel makes the deleted test fail, though when running it with Ipykernel <6.18, it passes because a different error is raised and not the one tested for. I have therefore deleted the test.

  from pyviz_comms import JupyterComm
  
  
  def raise_error(msg):
      if msg == 'Error':
          raise Exception()
  
  comm = JupyterComm(id='Test', on_msg=raise_error)
  comm._handle_msg({'content': {'data': 'Error'}})

  

[codecov-commenter]

Codecov Report

Merging #5649 (ec430cc) into main (7be3a7f) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #5649   +/-   ##
=======================================
  Coverage   88.30%   88.30%           
=======================================
  Files         302      302           
  Lines       62633    62626    -7     
=======================================
- Hits        55307    55302    -5     
+ Misses       7326     7324    -2     

Impacted Files	Coverage Δ
holoviews/tests/plotting/test_comms.py	100.00% <ø> (+4.08%)	⬆️

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[github-actions]

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