Bump serve-static and express in /docs-client #11493

Job	Run time
lint	5m 24s
build-ubicloud-standard-8-jdk-21-snapshot-blockhound	23m 25s
flaky-tests	11m 2s
site	6m 49s
build-macos-12-jdk-21	1h 7m 59s
build-windows-latest-jdk-21	59m 25s
build-ubicloud-standard-8-jdk-8	14m 18s
build-ubicloud-standard-8-jdk-11	16m 11s
build-ubicloud-standard-8-jdk-17-leak	18m 42s
build-ubicloud-standard-8-jdk-17-min-java-11	18m 50s
build-ubicloud-standard-8-jdk-17-min-java-17-coverage	23m 35s
	4h 25m 40s

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