[Snyk] Fix for 2 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	Priority Score (*)	Issue	Upgrade	Breaking Change	Exploit Maturity
	671/1000 Why? Recently disclosed, Has a fix available, CVSS 7.7	Deserialization of Untrusted Data SNYK-JAVA-COMGOOGLECODEGSON-1730327	com.google.code.gson:gson: 2.8.0 -> 2.8.9	No	No Known Exploit
	589/1000 Why? Has a fix available, CVSS 7.5	Web Cache Poisoning SNYK-JAVA-ORGECLIPSEJETTY-32383	com.sparkjava:spark-core: 2.7.2 -> 2.8.0	No	No Known Exploit

(*) Note that the real score may have changed since the PR was raised.

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

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