chore: Use fabric8 client v7.5.0 #6121

Job	Run time
sample_operators_tests (sample-operators/webpage)	3m 15s
sample_operators_tests (sample-operators/mysql-schema)	2m 59s
sample_operators_tests (sample-operators/tomcat-operator)	3m 21s
sample_operators_tests (sample-operators/leader-election)	3m 38s
	13m 13s

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