chore: bump fabric8 client to 7.8.0 (#3457) #7381

Job	Run time
sample_operators_tests (sample-operators/operations)	9m 44s
sample_operators_tests (sample-operators/tomcat-operator)	4m 16s
sample_operators_tests (sample-operators/leader-election)	4m 42s
sample_operators_tests (sample-operators/webpage)	4m 36s
sample_operators_tests (sample-operators/mysql-schema)	4m 18s
	27m 36s

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