fix(deps): update dependency io.camunda:zeebe-client-java to v8.6.6 (… #1986

Job	Run time
build-async-service-task	59s
build-element-template-generation	2m 54s
build-large-multi-instance-example	45s
build-parallel-operations	37s
build-payment-example-process-application	49s
build-react-tasklist	1m 3s
build-rollback-on-error-example	1m 9s
build-start-form-springboot	43s
build-synchronous-response-springboot	48s
build-timer-testing	3m 5s
build-twitter-review-java-springboot	54s
build-zeebe-client-plain-java	22s
	14m 8s

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