deps(ui): update dependency postcss to v8.4.19

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
postcss (source)	8.4.18 -> 8.4.19

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Release Notes

postcss/postcss

v8.4.19

Compare Source

• Fixed whitespace preserving after AST transformations (by Romain Menke).

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[codecov-commenter]

Codecov Report

Merging #1236 (aac555f) into main (94377d9) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #1236   +/-   ##
=======================================
  Coverage   35.97%   35.97%           
=======================================
  Files         295      295           
  Lines       13813    13813           
  Branches      283      283           
=======================================
  Hits         4969     4969           
  Misses       8278     8278           
  Partials      566      566           

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