chore: bump Fabric8 client to 7.6.1 #6501

Job	Run time
sample_operators_tests (sample-operators/leader-election)	3m 17s
sample_operators_tests (sample-operators/webpage)	3m 27s
sample_operators_tests (sample-operators/mysql-schema)	3m 5s
sample_operators_tests (sample-operators/tomcat-operator)	2m 47s
	12m 36s

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