fix(deps): update dependency io.camunda:zeebe-bom to v8.6.6 (#561) #1978

Job	Run time
build-parallel-operations	22s
build-large-multi-instance-example	40s
build-async-service-task	1m 17s
build-element-template-generation	2m 49s
build-payment-example-process-application	46s
build-react-tasklist	56s
build-start-form-springboot	33s
build-synchronous-response-springboot	39s
build-rollback-on-error-example	41s
build-timer-testing	3m 6s
build-zeebe-client-plain-java	21s
build-twitter-review-java-springboot	43s
	12m 53s

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