build(deps): bump com.fasterxml.jackson.core:jackson-core #1075

Job	Run time
Build Java Client JDK8 (samples/client/echo_api/java/okhttp-gson)	1m 11s
Build Java Client JDK8 (samples/client/echo_api/java/resttemplate)	43s
Build Java Client JDK8 (samples/client/echo_api/java/resteasy)	1m 4s
Build Java Client JDK8 (samples/client/echo_api/java/apache-httpclient)	1m 37s
Build Java Client JDK8 (samples/client/echo_api/java/feign-gson)	1m 31s
	6m 6s

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