chore(deps): update dependency postcss to v8.5.8

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss (source)	8.5.6 → 8.5.8

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Release Notes

postcss/postcss (postcss)

v8.5.8

Compare Source

• Fixed Processor#version.

v8.5.7

Compare Source

• Improved source map annotation cleaning performance (by CodeAnt AI).

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Configuration

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 92.41%. Comparing base (22819c5) to head (607230c).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #479   +/-   ##
=======================================
  Coverage   92.41%   92.41%           
=======================================
  Files          15       15           
  Lines         725      725           
=======================================
  Hits          670      670           
  Misses         46       46           
  Partials        9        9           

Flag	Coverage Δ
backend	92.41% <ø> (ø)
integration	92.41% <ø> (ø)
unittests	90.06% <ø> (ø)

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