Use importlib.version to remove import from show_versions

[Hoxbro]

Mainly to speed up the time it takes to run the command.

Also adds pyviz_comms to the list.

[codecov-commenter]

Codecov Report

Attention: 1 lines in your changes are missing coverage. Please review.

Comparison is base (62b7f1e) 88.65% compared to head (03d38d5) 88.66%.
Report is 2 commits behind head on main.

Files	Patch %	Lines
holoviews/util/_versions.py	50.00%	1 Missing ⚠️

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #6072      +/-   ##
==========================================
+ Coverage   88.65%   88.66%   +0.01%     
==========================================
  Files         314      314              
  Lines       65688    65764      +76     
==========================================
+ Hits        58234    58310      +76     
  Misses       7454     7454              

Flag	Coverage Δ
ui-tests	23.65% <50.00%> (-0.02%)	⬇️

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