Bump follow-redirects from 1.15.1 to 1.15.6 in /nflow-explorer #632

Job	Run time
build-and-test-nflow-explorer	2m 40s
javadoc-spotbugs-codeql	3m 56s
build-and-test (17)	1m 1s
integration-tests (17, h2)	3m 49s
build-and-test (21)	1m 1s
integration-tests (17, mariadb)	4m 18s
build-and-test (22)	1m 2s
integration-tests (17, postgresql)	4m 12s
integration-tests (17, mysql)	4m 33s
integration-tests (17, sqlserver)	4m 49s
integration-tests (17, db2)	5m 43s
integration-tests (17, oracle)	5m 2s
integration-tests (21, h2)	3m 53s
integration-tests (21, mariadb)	4m 17s
integration-tests (21, postgresql)	4m 21s
integration-tests (21, mysql)	4m 30s
integration-tests (21, sqlserver)	4m 47s
integration-tests (21, db2)	5m 58s
integration-tests (21, oracle)	4m 48s
	1h 14m 40s

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