Support ipywidgets 8.x

[yakutovicha]

fixes #473

[codecov]

Codecov Report

Attention: Patch coverage is 43.75000% with 9 lines in your changes missing coverage. Please review.

Project coverage is 83.31%. Comparing base (1f400bc) to head (76fbd22).

Files with missing lines	Patch %	Lines
aiidalab_widgets_base/computational_resources.py	22.22%	7 Missing ⚠️
aiidalab_widgets_base/structures.py	71.42%	2 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #644      +/-   ##
==========================================
- Coverage   83.43%   83.31%   -0.12%     
==========================================
  Files          17       17              
  Lines        3550     3555       +5     
==========================================
  Hits         2962     2962              
- Misses        588      593       +5     

Flag	Coverage Δ
python-3.11	83.31% <43.75%> (-0.12%)	⬇️
python-3.9	83.35% <43.75%> (-0.12%)	⬇️

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