perf: update css-parser to 0.13.11 and use child_count

[bartveneman]

No description provided.

[codecov-commenter]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 98.21%. Comparing base (be1e11e) to head (c41770c).

Additional details and impacted files

@@           Coverage Diff           @@
##             main      #89   +/-   ##
=======================================
  Coverage   98.21%   98.21%           
=======================================
  Files          32       32           
  Lines         896      897    +1     
  Branches      240      240           
=======================================
+ Hits          880      881    +1     
  Misses         13       13           
  Partials        3        3           

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[codecov-commenter]

Bundle Report

Changes will decrease total bundle size by 1 bytes (-0.0%) ⬇️. This is within the configured threshold ✅

Detailed changes

Bundle name	Size	Change
stylelintPlugin-esm	61.32kB	-1 bytes (-0.0%) ⬇️

Affected Assets, Files, and Routes:

view changes for bundle: stylelintPlugin-esm

Assets Changed:

Asset Name	Size Change	Total Size	Change (%)
index.mjs	-1 bytes	57.16kB	-0.0%

Files in index.mjs:

• ./src/rules/max-average-selectors-per-rule/index.ts → Total Size: 1.41kB

• ./src/utils/media-conditions.ts → Total Size: 6.22kB