Bump xstream from 1.4.7 to 1.4.15 in /spring-batch-admin-parent#12

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dependabot/maven/spring-batch-admin-parent/com.thoughtworks.xstream-xstream-1.4.15GeoKnow/spring-batch-admin:dependabot/maven/spring-batch-admin-parent/com.thoughtworks.xstream-xstream-1.4.15Copy head branch name to clipboard