[Snyk] Fix for 4 vulnerabilities

[snyk-bot]

Snyk has created this PR to fix one or more vulnerable packages in the `maven` dependencies of this project.

Changes included in this PR

• Changes to the following files to upgrade the vulnerable dependencies to a fixed version:
  • pom.xml

Vulnerabilities that will be fixed

With an upgrade:

Severity	Issue	Upgrade	Breaking Change	Exploit Maturity
	Deserialization of Untrusted Data SNYK-JAVA-COMFASTERXMLJACKSONCORE-560762	net.logstash.logback:logstash-logback-encoder: 6.2 -> 6.3	No	No Known Exploit
	Deserialization of Untrusted Data SNYK-JAVA-COMFASTERXMLJACKSONCORE-560766	net.logstash.logback:logstash-logback-encoder: 6.2 -> 6.3	No	No Known Exploit
	Deserialization of Untrusted Data SNYK-JAVA-COMFASTERXMLJACKSONCORE-561362	net.logstash.logback:logstash-logback-encoder: 6.2 -> 6.3	No	No Known Exploit
	Deserialization of Untrusted Data SNYK-JAVA-COMFASTERXMLJACKSONCORE-561373	net.logstash.logback:logstash-logback-encoder: 6.2 -> 6.3	No	No Known Exploit

Vulnerabilities that could not be fixed

• Upgrade:
  • Could not upgrade com.fasterxml.jackson.core:jackson-databind@2.9.9.3 to com.fasterxml.jackson.core:jackson-databind@2.10.0; Reason could not apply upgrade, dependency is managed externally ; Location: https://maven-central.storage-download.googleapis.com/repos/central/data/net/logstash/logback/logstash-logback-encoder/6.2/logstash-logback-encoder-6.2.pom

Check the changes in this PR to ensure they won't cause issues with your project.

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