build: update dependency postcss to v8.5.4 #1611

Job	Run time
build	12s
lint	2m 6s
e2e_windows (windows-2025, 22, npm, 0)	27s
e2e_windows (windows-2025, 22, npm, 2)	1m 2s
e2e_windows (windows-2025, 22, npm, 5)	28s
e2e_windows (windows-2025, 22, npm, 1)	34s
e2e_windows (windows-2025, 22, npm, 3)	28s
e2e_windows (windows-2025, 22, esbuild, 1)	27s
e2e_windows (windows-2025, 22, esbuild, 0)	49s
e2e_windows (windows-2025, 22, npm, 4)	27s
e2e_windows (windows-2025, 22, esbuild, 5)	27s
e2e_windows (windows-2025, 22, esbuild, 4)	26s
e2e_windows (windows-2025, 22, esbuild, 2)	26s
e2e_windows (windows-2025, 22, esbuild, 3)	25s
Browser Compatibility Tests	0s
test	0s
publish-snapshots	0s
e2e-snapshots	0s
e2e	0s
e2e-package-managers	-1s
	8m 43s

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