Bump spark.version from 2.3.1 to 2.4.8 in /tensorflow/java/maven/spark-tensorflow-connector#2

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dependabot/maven/tensorflow/java/maven/spark-tensorflow-connector/spark.version-2.4.8Allyn69/tensorflow:dependabot/maven/tensorflow/java/maven/spark-tensorflow-connector/spark.version-2.4.8Copy head branch name to clipboard