Bump dompurify from 3.3.3 to 3.4.0 in /docs #1923

Job	Run time
build docs	23s
build (windows-latest, node 14, npm 8)	3m 30s
build (ubuntu-latest, node 14, npm 8)	1m 20s
build (ubuntu-latest, node 14, npm 6)	1m 28s
build (ubuntu-latest, node 20, npm 11)	1m 14s
build (windows-latest, node 20, npm 11)	3m 4s
	10m 59s

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