Bump postcss from 8.5.8 to 8.5.10 #1964

Job	Run time
build docs	18s
build (ubuntu-latest, node 14, npm 8)	1m 47s
build (ubuntu-latest, node 14, npm 6)	1m 18s
build (ubuntu-latest, node 20, npm 11)	1m 12s
build (windows-latest, node 14, npm 8)	4m 38s
build (windows-latest, node 20, npm 11)	4m 4s
	13m 17s

Provide feedback