Bump express from 4.19.2 to 4.21.1 #11706

Job	Run time
build-data-server-pip (native, ubuntu-20.04, 1.65.0)	1m 16s
build-data-server-pip (native, macos-12, 1.65.0)	1m 36s
lint-python-flake8 (3.9)	12s
lint-python-yaml-docs	18s
lint-python-flake8 (3.10)	13s
build-data-server-pip (universal, ubuntu-20.04, 1.65.0)	7s
lint-misc	11s
lint-python-flake8 (3.11)	11s
lint-rust (1.65.0, 0.16.1)	36s
lint-frontend	1m 17s
build (tf, 3.9)	1h 16m 13s
build (notf, 3.9)	1h 10m 58s
	2h 33m 8s

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