Bump groovy from 1.8.9 to 2.4.21 in /activiti-process-listener#71

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dependabot/maven/activiti-process-listener/org.codehaus.groovy-groovy-2.4.21cherkavi/java-code-example:dependabot/maven/activiti-process-listener/org.codehaus.groovy-groovy-2.4.21Copy head branch name to clipboard