Bump tensorflow from 1.4.1 to 2.6.4 in /Lesson-4/activity_9#50

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dependabot/pip/Lesson-4/activity_9/tensorflow-2.6.4TrainingByPackt/Beginning-Application-Development-with-TensorFlow-and-Keras:dependabot/pip/Lesson-4/activity_9/tensorflow-2.6.4Copy head branch name to clipboard