Bump express from 4.19.2 to 4.21.0 (#1827) #1746

Job	Run time
CI / Generate matrix	12s
CI / Context	1s
CI / Check governance	1s
CI / 8.1 prf-low mysql57 phpunit all	2m 5s
CI / 8.2 mariadb phpunit all	2m 22s
CI / 8.3 mysql80 phpunit all	2m 6s
CI / 8.3 mysql84 phpunit all	2m 8s
CI / 8.1 mysql57 phplinting	1m 50s
CI / 8.1 mysql57 endtoend root job1	10m 41s
CI / 8.3 mysql80 endtoend root job1	10m 57s
CI / 8.1 mysql57 endtoend root job2	8m 57s
CI / 8.3 mysql80 endtoend root job2	8m 13s
CI / 8.1 mysql57 endtoend root job3	9m 46s
CI / 8.3 mysql80 endtoend root job3	9m 15s
CI / 8.1 mysql57 js	5m 17s
CI / Dispatch tag patch release	2s
	1h 13m 53s

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