Bump xstream from 1.4.15 to 1.4.18 in /hmis-survey-api#402

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dependabot/maven/hmis-survey-api/com.thoughtworks.xstream-xstream-1.4.18hserv/coordinated-entry:dependabot/maven/hmis-survey-api/com.thoughtworks.xstream-xstream-1.4.18Copy head branch name to clipboard