fix(deps): update spring-zeebe.version to v8.5.15 #2043

Job	Run time
build-twitter-review-java-springboot	32s
build-async-service-task	1m 0s
build-rollback-on-error-example	40s
build-large-multi-instance-example	39s
build-start-form-springboot	20s
build-synchronous-response-springboot	24s
build-timer-testing	47s
build-zeebe-client-plain-java	24s
build-element-template-generation	2m 47s
build-event-processing	1m 39s
build-parallel-operations	32s
build-payment-example-process-application	5m 10s
build-react-tasklist	1m 1s
	15m 55s

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