Bump xstream from 1.4.4 to 1.4.15 in /stompjms-activemq-test#38

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dependabot/maven/stompjms-activemq-test/com.thoughtworks.xstream-xstream-1.4.15fusesource/stompjms:dependabot/maven/stompjms-activemq-test/com.thoughtworks.xstream-xstream-1.4.15Copy head branch name to clipboard