chore(deps): bump serve-static and express in /docs #8976

Job	Run time
build	51s
node-docker-image / build	5m 9s
lint	2m 1s
test-utils / test	34s
utils / test	50s
autocertifier-server / test	46s
cdn-location / test	29s
cli-tools / test	4m 21s
dht / test	1m 37s
dht-browser / test	5m 24s
geoip-location / test	54s
node / test	1m 29s
node-e2e / test	5m 22s
proto-rpc / test	56s
sdk / test	2m 30s
sdk-browser / test	2m 0s
sdk-browser-e2e / test	5m 18s
sdk-e2e / test	4m 34s
trackerless-network / test	2m 25s
trackerless-network-browser / test	2m 39s
	50m 9s

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