Build(deps-dev): bump postcss from 8.5.9 to 8.5.12 #2226

Job	Run time
Lint SCSS / Run Stylelint	15s
Lint JavaScript / Run Standardx	19s
CodeQL SAST scan / Analyze	1m 34s
Security Analysis / Run Brakeman	23s
Test JavaScript / Run Jasmine	50s
Dependency Review scan / dependency-review-pr	7s
Lint Ruby / Run RuboCop	15s
Test Ruby / Run RSpec	1m 2s
Dependency Review scan / dependency-review-push	0s
	4m 45s

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