chore: bump fabric8 client to 7.5.1 (#3126) #6136

Job	Run time
sample_operators_tests (sample-operators/webpage)	3m 31s
sample_operators_tests (sample-operators/tomcat-operator)	2m 53s
sample_operators_tests (sample-operators/mysql-schema)	3m 3s
sample_operators_tests (sample-operators/leader-election)	3m 41s
	13m 8s

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