Update dependency com.thoughtworks.xstream:xstream to v1.4.20 - autoclosed

[mend-for-github-com[bot]]

This PR contains the following updates:

Package	Type	Update	Change
com.thoughtworks.xstream:xstream (source)	compile	patch	1.4.18 -> 1.4.20

By merging this PR, the below issues will be automatically resolved and closed:

Severity	CVSS Score	CVE	GitHub Issue
High	7.5	CVE-2021-43859	#96
High	7.5	CVE-2022-40151	#98
High	7.5	CVE-2022-41966	#51

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