Bump express from 4.18.2 to 4.21.0 #11016

Job	Run time
TestJS - yoastseo (onlyChanged)	5s
TestJS - analysis-report (full)	4m 48s
TestJS - browserslist-config (full)	4m 42s
TestJS - components (full)	4m 52s
TestJS - feature-flag (full)	4m 45s
TestJS - helpers (full)	4m 55s
TestJS - js (full)	5m 33s
TestJS - replacement-variable-editor (full)	4m 53s
TestJS - search-metadata-previews (full)	4m 53s
TestJS - social-metadata-forms (full)	4m 56s
TestJS - social-metadata-previews (full)	4m 49s
	49m 11s

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