fix: update css-parser to format keyframes selectors

[bartveneman]

closes #142

[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 100.00%. Comparing base (b2d3563) to head (26600df).
⚠️ Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff            @@
##              main      #143   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files            1         1           
  Lines          332       332           
  Branches       114       114           
=========================================
  Hits           332       332           

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[codecov]

Bundle Report

Bundle size has no change ✅