Bump xstream from 1.3.1 to 1.4.15 in /oet-parser#58

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dependabot/maven/oet-parser/com.thoughtworks.xstream-xstream-1.4.15openEHR/java-libs:dependabot/maven/oet-parser/com.thoughtworks.xstream-xstream-1.4.15Copy head branch name to clipboard