chore(deps): update dependency com.thoughtworks.xstream:xstream to v1.4.20

[mend-for-github-com]

This PR contains the following updates:

Package	Type	Update	Change
com.thoughtworks.xstream:xstream (source)	compile	patch	1.4.17 -> 1.4.20

By merging this PR, the below vulnerabilities will be automatically resolved:

Severity	CVSS Score	CVE
High	8.8	CVE-2021-39139
High	8.5	CVE-2021-39141
High	8.5	CVE-2021-39144
High	8.5	CVE-2021-39145
High	8.5	CVE-2021-39146
High	8.5	CVE-2021-39147
High	8.5	CVE-2021-39148
High	8.5	CVE-2021-39149
High	8.5	CVE-2021-39150
High	8.5	CVE-2021-39151
High	8.5	CVE-2021-39152
High	8.5	CVE-2021-39153
High	8.5	CVE-2021-39154
High	7.5	CVE-2021-43859
High	7.5	CVE-2022-40151
High	7.5	CVE-2022-41966
Medium	6.3	CVE-2021-39140

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