Bump express from 4.19.2 to 4.21.1 #512

Job	Run time
vars	2s
docker / docker	33s
tests / api-e2e-test	13m 56s
sites / Deploy sites	6m 59s
electron / electron (macos-latest)	9m 20s
tests / e2e-test (macos-latest)	14m 31s
electron / electron (ubuntu-latest)	9m 54s
tests / e2e-test (ubuntu-latest)	8m 16s
electron / electron (windows-latest)	9m 53s
tests / test (macos-latest)	12m 36s
tests / test (ubuntu-latest)	12m 55s
	1h 38m 55s

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