Bump ivy from 2.4.0 to 2.5.1 in /spark-2.1.1#28

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dependabot/maven/spark-2.1.1/org.apache.ivy-ivy-2.5.1shiwendai/SparkSourceCodeLearning:dependabot/maven/spark-2.1.1/org.apache.ivy-ivy-2.5.1Copy head branch name to clipboard