chore(deps): update dependency postcss to v8.5.6

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.5.4 -> 8.5.6

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Release Notes

postcss/postcss (postcss)

v8.5.6

Compare Source

• Fixed ContainerWithChildren type discriminating (by @​Goodwine).

v8.5.5

Compare Source

• Fixed package.json→exports compatibility with some tools (by @​JounQin).

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Configuration

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 95.31%. Comparing base (3e1fe78) to head (889ba3e).
Report is 6 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #2761      +/-   ##
==========================================
- Coverage   95.32%   95.31%   -0.01%     
==========================================
  Files         390      390              
  Lines       24001    24001              
  Branches      584      582       -2     
==========================================
- Hits        22879    22877       -2     
- Misses        540      542       +2     
  Partials      582      582              

see 2 files with indirect coverage changes

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