web: bump @codemirror/legacy-modes from 6.4.0 to 6.4.1 in /web #23563

Job	Run time
lint (lint, web)	1m 53s
lint (lint, tests/wdio)	44s
lint (lint:lockfile, web)	1m 45s
lint (tsc, web)	1m 48s
lint (prettier-check, web)	1m 50s
lint (prettier-check, tests/wdio)	54s
lint (lit-analyse, web)	2m 4s
ci-web-mark	1s
test	2m 3s
build	1m 42s
	14m 44s

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