ci: Use Microsoft channel for pytest-playwright

[hoxbro]

pytest-playwright was added to conda-forge a couple of days ago, but it does not support Windows; therefore, we still use the one provided by the Microsoft channel.

• Add pytest-playwright conda-forge/staged-recipes#27927
• https://anaconda.org/conda-forge/playwright

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 82.23%. Comparing base (87ef019) to head (465c10f).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #7424      +/-   ##
==========================================
- Coverage   82.23%   82.23%   -0.01%     
==========================================
  Files         337      337              
  Lines       50634    50634              
==========================================
- Hits        41641    41639       -2     
- Misses       8993     8995       +2     

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