Bump xstream from 1.3.1 to 1.4.19 in /tcslackbuildnotifier-core#204

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dependabot/maven/tcslackbuildnotifier-core/com.thoughtworks.xstream-xstream-1.4.19PeteGoo/tcSlackBuildNotifier:dependabot/maven/tcslackbuildnotifier-core/com.thoughtworks.xstream-xstream-1.4.19Copy head branch name to clipboard