chore: update to Fabric8 client 7.8.0 #7342

Job	Run time
sample_operators_tests (sample-operators/mysql-schema)	4m 1s
sample_operators_tests (sample-operators/operations)	9m 30s
sample_operators_tests (sample-operators/tomcat-operator)	4m 0s
sample_operators_tests (sample-operators/leader-election)	4m 38s
sample_operators_tests (sample-operators/webpage)	4m 30s
	26m 39s

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