Bump spark.version from 2.3.2 to 2.4.7 in /04-machine_learning/02-sparkml_examples/04-spark_CTRmodel#6

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dependabot/maven/04-machine_learning/02-sparkml_examples/04-spark_CTRmodel/spark.version-2.4.7MachineLP/CodeFun:dependabot/maven/04-machine_learning/02-sparkml_examples/04-spark_CTRmodel/spark.version-2.4.7Copy head branch name to clipboard