fix(deps): update dependency io.camunda:zeebe-client-java to v8.6.6 #1982

Job	Run time
build-async-service-task	1m 3s
build-element-template-generation	4m 17s
build-large-multi-instance-example	54s
build-parallel-operations	23s
build-payment-example-process-application	41s
build-react-tasklist	1m 7s
build-rollback-on-error-example	47s
build-start-form-springboot	28s
build-synchronous-response-springboot	38s
build-timer-testing	2m 52s
build-twitter-review-java-springboot	52s
build-zeebe-client-plain-java	26s
	14m 28s

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