Bump groovy from 2.1.9 to 2.4.21 in /extensions/groovy#11

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dependabot/maven/extensions/groovy/org.codehaus.groovy-groovy-2.4.21apache/incubator-batchee:dependabot/maven/extensions/groovy/org.codehaus.groovy-groovy-2.4.21Copy head branch name to clipboard