Bump postcss from 8.5.16 to 8.5.25 in /docs #734

Job	Run time
cs-stan / Coding Standard & Static Analysis	37s
testsuite / testsuite-linux (8.2, mysql, highest, false)	58s
testsuite / testsuite-linux (8.3, sqlite, highest, false)	30s
testsuite / testsuite-linux (8.2, pgsql, highest, false)	55s
testsuite / testsuite-linux (8.4, mysql, highest, false)	57s
testsuite / testsuite-linux (8.5, sqlite, highest, false)	43s
testsuite / testsuite-linux (8.2, sqlite, lowest, false)	30s
	5m 10s

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