Bump xstream from 1.4.8 to 1.4.18 in /metre#14

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mastersplennon/College:masterfrom

dependabot/maven/metre/com.thoughtworks.xstream-xstream-1.4.18splennon/College:dependabot/maven/metre/com.thoughtworks.xstream-xstream-1.4.18Copy head branch name to clipboard