Bump xstream from 1.4.8 to 1.4.15 in /calvalus-processing#17

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dependabot/maven/calvalus-processing/com.thoughtworks.xstream-xstream-1.4.15bcdev/calvalus2:dependabot/maven/calvalus-processing/com.thoughtworks.xstream-xstream-1.4.15Copy head branch name to clipboard