[Snyk] Security upgrade org.openapitools:jackson-databind-nullable from 0.2.6 to 0.2.7 #14

Job	Run time
Build Java Client JDK8 (samples/client/echo_api/java/apache-httpclient)	1m 6s
Build Java Client JDK8 (samples/client/echo_api/java/okhttp-gson)	1m 4s
Build Java Client JDK8 (samples/client/echo_api/java/resttemplate)	56s
Build Java Client JDK8 (samples/client/echo_api/java/feign-gson)	50s
Build Java Client JDK8 (samples/client/echo_api/java/resteasy)	53s
	4m 49s

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