chore: bump Fabric8 client to 7.6.0 #6286

Job	Run time
check_format_and_unit_tests	2m 14s
build / Special integration tests (17)	2m 36s
build / Special integration tests (25)	2m 8s
build / Special integration tests (21)	2m 33s
build / httpclient-tests (jdk) / Integration tests (25, 1.32.0, jdk)	26m 15s
build / httpclient-tests (jetty) / Integration tests (25, 1.32.0, jetty)	25m 45s
build / httpclient-tests (vertx) / Integration tests (25, 1.32.0, vertx)	25m 59s
build / integration_tests (21, 1.31.8) / Integration tests (21, 1.31.8, vertx)	26m 8s
build / integration_tests (17, 1.30.12) / Integration tests (17, 1.30.12, vertx)	25m 21s
build / integration_tests (25, 1.30.12) / Integration tests (25, 1.30.12, vertx)	25m 2s
build / integration_tests (21, 1.32.4) / Integration tests (21, 1.32.4, vertx)	25m 28s
build / integration_tests (25, 1.31.8) / Integration tests (25, 1.31.8, vertx)	25m 48s
build / integration_tests (17, 1.31.8) / Integration tests (17, 1.31.8, vertx)	26m 24s
build / integration_tests (25, 1.33.1) / Integration tests (25, 1.33.1, vertx)	27m 9s
build / integration_tests (21, 1.33.1) / Integration tests (21, 1.33.1, vertx)	26m 59s
build / integration_tests (25, 1.32.4) / Integration tests (25, 1.32.4, vertx)	25m 56s
build / integration_tests (17, 1.32.4) / Integration tests (17, 1.32.4, vertx)	26m 51s
build / integration_tests (17, 1.33.1) / Integration tests (17, 1.33.1, vertx)	27m 7s
build / integration_tests (21, 1.30.12) / Integration tests (21, 1.30.12, vertx)	25m 18s
	6h 41m 1s

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