Fix/docs asyncio warning

[danibene]

Description

This PR aims to fix the following warning (not sure how to test without opening PR, so wait until docs passes before merging please)

D:\a\NeuroKit\NeuroKit\docs\examples\bio_custom\bio_custom.ipynb: Executing notebook using local CWD [mystnb]
C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\site-packages\zmq\_future.py:681: RuntimeWarning: Proactor event loop does not implement add_reader family of methods required for zmq. Registering an additional selector thread for add_reader support via tornado. Use `asyncio.set_event_loop_policy(WindowsSelectorEventLoopPolicy())` to avoid this warning.
  self._get_loop()

[codeclimate]

Code Climate has analyzed commit fbcb6b6 and detected 0 issues on this pull request.

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[codecov-commenter]

Codecov Report

Patch coverage: 85.91% and project coverage change: +1.13 🎉

Comparison is base (f6d4d2d) 54.12% compared to head (f823fb9) 55.25%.

Additional details and impacted files

@@            Coverage Diff             @@
##              dev     #862      +/-   ##
==========================================
+ Coverage   54.12%   55.25%   +1.13%     
==========================================
  Files         295      296       +1     
  Lines       13810    13914     +104     
==========================================
+ Hits         7474     7688     +214     
+ Misses       6336     6226     -110     

Impacted Files	Coverage Δ
neurokit2/eda/eda_process.py	92.00% <ø> (ø)
neurokit2/misc/report.py	94.18% <ø> (+2.32%)	⬆️
neurokit2/ppg/ppg_clean.py	70.58% <33.33%> (ø)
neurokit2/ppg/ppg_methods.py	85.29% <66.66%> (ø)
neurokit2/emg/emg_clean.py	83.33% <75.00%> (+1.51%)	⬆️
neurokit2/events/events_find.py	80.00% <75.00%> (-0.96%)	⬇️
neurokit2/ecg/ecg_clean.py	86.95% <85.71%> (+0.19%)	⬆️
neurokit2/signal/signal_filter.py	70.90% <86.66%> (+2.28%)	⬆️
neurokit2/emg/emg_methods.py	90.00% <90.00%> (ø)
neurokit2/emg/emg_plot.py	93.33% <90.24%> (-4.45%)	⬇️
... and 3 more

... and 9 files with indirect coverage changes

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[danibene]

I vaguely remember this already being an issue, not sure what was done:

C:\hostedtoolcache\windows\Python\3.10.11\x64\lib\site-packages\sklearn\utils\extmath.py:193: RuntimeWarning: invalid value encountered in matmul
  ret = a @ b
<<<-------------------------------------------------------------------------

[danibene]

@DominiqueMakowski the docs check passes when the versions of numpy and ipykernel are downgraded, should ideally be investigated but for now are you fine with me merging with these fixed versions of numpy/ipykernel?

[DominiqueMakowski]

More than fine, so we can release the dev

Thanks again Dani for all your work :)