chore: bump fabric8 client to 7.5.1 #6134

Job	Run time
sample_operators_tests (sample-operators/tomcat-operator)	3m 6s
sample_operators_tests (sample-operators/leader-election)	3m 28s
sample_operators_tests (sample-operators/webpage)	3m 16s
sample_operators_tests (sample-operators/mysql-schema)	3m 0s
	12m 50s

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