Bump express from 4.19.2 to 4.21.0 #5379

Job	Run time
Validate Composer	21s
Run Cypress functional tests	7m 46s
Lint Markdown	39s
Lint Drupal assets	37s
Test site performance using Lighthouse	5m 59s
Check code style	24s
Test accessibility using Pa11y	4m 45s
Analyse code using PHPStan	37s
Run PHP unit tests	45s
Shellcheck	6s
Check Twig code style	21s
Check Drupal Config	4m 6s
Check OpenAPI specification	4m 24s
Check PHP version	20s
Lint Cypress tests	39s
	31m 49s

Provide feedback