chore: update to Fabric8 client 6.13.4 #4789

Job	Run time
check_format_and_unit_tests	1m 48s
check_format_and_unit_tests	1m 48s
special_integration_tests (11)	2m 16s
special_integration_tests (11)	2m 16s
special_integration_tests (17)	1m 58s
special_integration_tests (17)	1m 58s
httpclient-tests (jdk) / integration_tests	21m 10s
httpclient-tests (jdk) / integration_tests	21m 10s
httpclient-tests (jetty) / integration_tests	20m 41s
httpclient-tests (jetty) / integration_tests	20m 41s
httpclient-tests (vertx) / integration_tests	20m 46s
httpclient-tests (vertx) / integration_tests	20m 46s
integration_tests (11, 1.30.3) / integration_tests	19m 8s
integration_tests (11, 1.30.3) / integration_tests	19m 42s
integration_tests (11, 1.31.0) / integration_tests	19m 10s
integration_tests (11, 1.31.0) / integration_tests	20m 52s
integration_tests (11, v1.28.12) / integration_tests	19m 9s
integration_tests (11, v1.28.12) / integration_tests	19m 57s
integration_tests (11, v1.29.7) / integration_tests	19m 8s
integration_tests (11, v1.29.7) / integration_tests	19m 56s
integration_tests (17, 1.31.0) / integration_tests	18m 49s
integration_tests (17, 1.31.0) / integration_tests	20m 35s
integration_tests (17, 1.30.3) / integration_tests	19m 7s
integration_tests (17, 1.30.3) / integration_tests	20m 6s
integration_tests (17, v1.28.12) / integration_tests	19m 7s
integration_tests (17, v1.28.12) / integration_tests	20m 22s
integration_tests (17, v1.29.7) / integration_tests	19m 9s
integration_tests (17, v1.29.7) / integration_tests	19m 51s
	7h 31m 26s

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