Bump xstream from 1.4.8 to 1.4.15 in /clonedetector#14

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dependabot/maven/clonedetector/com.thoughtworks.xstream-xstream-1.4.15Programming-Systems-Lab/ioclones:dependabot/maven/clonedetector/com.thoughtworks.xstream-xstream-1.4.15Copy head branch name to clipboard