use <6 version of plotly for documentation and use latest for other purposes

[The-Broken-Keyboard]

Fixes #129 temporarily.

Changes code so that:

• Doc builds with plotly version < 6
• Other functionalities work with current plotly version

Issue is because of latest update of plotly, due to which the default interactive renderer ( plotly_mimetype+notebook ) of figure.show() in plotly is not supporting anymore in sphinx. While renderers like svg , png etc. are still supported.

When the issue gets fixed in plotly, sphinx or other related packages, then we can comeback to resolve it.

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📚 Documentation preview 📚: https://arviz-plots--136.org.readthedocs.build/en/136/

[codecov-commenter]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 78.96%. Comparing base (15836bf) to head (789e79e).

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #136   +/-   ##
=======================================
  Coverage   78.96%   78.96%           
=======================================
  Files          28       28           
  Lines        3266     3266           
=======================================
  Hits         2579     2579           
  Misses        687      687           

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