SWI-3723 [Snyk] Security upgrade org.openapitools:jackson-databind-nullable from 0.2.6 to 0.2.7

[bwappsec]

Snyk has created this PR to fix 2 vulnerabilities in the maven dependencies of this project.

Snyk changed the following file(s):

• samples/client/echo_api/java/feign-gson/pom.xml

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score	Upgrade
	Stack-based Buffer Overflow SNYK-JAVA-COMFASTERXMLJACKSONCORE-10500754	124	org.openapitools:jackson-databind-nullable: 0.2.6 -> 0.2.7 No Path Found No Known Exploit
	Denial of Service (DoS) SNYK-JAVA-COMFASTERXMLJACKSONCORE-7569538	115	org.openapitools:jackson-databind-nullable: 0.2.6 -> 0.2.7 No Path Found No Known Exploit

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[bwappsec]

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