Bump express from 4.18.1 to 4.19.2 in /nflow-explorer #634

Job	Run time
build-and-test-nflow-explorer	2m 58s
build-and-test (17)	1m 6s
build-and-test (21)	1m 10s
build-and-test (22)	1m 1s
integration-tests (17, h2)	3m 41s
integration-tests (17, mariadb)	4m 11s
javadoc-spotbugs-codeql	3m 55s
integration-tests (17, postgresql)	4m 7s
integration-tests (17, mysql)	4m 27s
integration-tests (17, sqlserver)	4m 35s
integration-tests (17, db2)	5m 35s
integration-tests (17, oracle)	4m 54s
integration-tests (21, h2)	3m 44s
integration-tests (21, mariadb)	4m 23s
integration-tests (21, postgresql)	4m 3s
integration-tests (21, mysql)	4m 41s
integration-tests (21, sqlserver)	4m 56s
integration-tests (21, db2)	6m 4s
integration-tests (21, oracle)	5m 5s
	1h 14m 36s

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