fix(deps): update dependency postcss to v8.5.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Confidence
postcss (source)	8.5.14 → 8.5.15

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Release Notes

postcss/postcss (postcss)

v8.5.15

Compare Source

• Fixed declaration parsing performance (by @​homanp).

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Latest commit: 31f97e4

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 95.26%. Comparing base (3a5ec03) to head (31f97e4).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #2859   +/-   ##
========================================
  Coverage    95.26%   95.26%           
========================================
  Files           73       73           
  Lines         1773     1773           
  Branches       553      553           
========================================
  Hits          1689     1689           
  Misses          84       84           

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