[Snyk] Upgrade com.thoughtworks.xstream:xstream from 1.4.5 to 1.4.15

[snyk-bot]

Snyk has created this PR to upgrade com.thoughtworks.xstream:xstream from 1.4.5 to 1.4.15.

:information_source: Keep your dependencies up-to-date. This makes it easier to fix existing vulnerabilities and to more quickly identify and fix newly disclosed vulnerabilities when they affect your project.

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• The recommended version is 17 versions ahead of your current version.
• The recommended version was released 3 months ago, on 2020-12-12.

The recommended version fixes:

Severity	Issue	PriorityScore (*)	Exploit Maturity
	Denial of Service (DoS) SNYK-JAVA-COMTHOUGHTWORKSXSTREAM-31394	589/1000 Why? Has a fix available, CVSS 7.5	No Known Exploit
	XML External Entity (XXE) Injection SNYK-JAVA-COMTHOUGHTWORKSXSTREAM-30385	589/1000 Why? Has a fix available, CVSS 7.5	No Known Exploit
	Deserialization of Untrusted Data SNYK-JAVA-COMTHOUGHTWORKSXSTREAM-1040458	589/1000 Why? Has a fix available, CVSS 7.5	Proof of Concept
	Insecure XML deserialization SNYK-JAVA-COMTHOUGHTWORKSXSTREAM-460764	589/1000 Why? Has a fix available, CVSS 7.5	Proof of Concept
	Server-Side Request Forgery (SSRF) SNYK-JAVA-COMTHOUGHTWORKSXSTREAM-1051967	589/1000 Why? Has a fix available, CVSS 7.5	Mature
	Arbitrary File Deletion SNYK-JAVA-COMTHOUGHTWORKSXSTREAM-1051966	589/1000 Why? Has a fix available, CVSS 7.5	Proof of Concept

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

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