Bump tensorflow from 1.9.0 to 1.15.4 in /train_keras_2_2_4_cpu#18

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dependabot/pip/train_keras_2_2_4_cpu/tensorflow-1.15.4yosuke-yasuda/deep_learning_docker_cluster:dependabot/pip/train_keras_2_2_4_cpu/tensorflow-1.15.4Copy head branch name to clipboard