chore: fabric8 client to v7.3 #5168

Job	Run time
sample_operators_tests (sample-operators/webpage)	3m 13s
sample_operators_tests (sample-operators/tomcat-operator)	2m 50s
sample_operators_tests (sample-operators/leader-election)	3m 26s
sample_operators_tests (sample-operators/mysql-schema)	2m 41s
	12m 10s

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