Bump xstream from 1.4.11.1 to 1.4.15 in /zmq-playground#32

dependabot[bot] wants to merge 1 commit intomastertestusr/Experiments:masterfrom

dependabot/maven/zmq-playground/com.thoughtworks.xstream-xstream-1.4.15testusr/Experiments:dependabot/maven/zmq-playground/com.thoughtworks.xstream-xstream-1.4.15Copy head branch name to clipboard