[Snyk] Security upgrade com.thoughtworks.xstream:xstream from 1.4.2 to 1.4.15

[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
	551/1000 Why? Recently disclosed, Has a fix available, CVSS 5.3	Command Injection SNYK-JAVA-COMTHOUGHTWORKSXSTREAM-1051966	com.thoughtworks.xstream:xstream: 1.4.2 -> 1.4.15	No	No Known Exploit
	611/1000 Why? Recently disclosed, Has a fix available, CVSS 6.5	Server-Side Request Forgery (SSRF) SNYK-JAVA-COMTHOUGHTWORKSXSTREAM-1051967	com.thoughtworks.xstream:xstream: 1.4.2 -> 1.4.15	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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