Bump tensorflow from 2.5.1 to 2.6.4 in /demos/mirfBrainTumor/segmentation#12

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dependabot/pip/demos/mirfBrainTumor/segmentation/tensorflow-2.6.4MathAndMedLab/MIRF2:dependabot/pip/demos/mirfBrainTumor/segmentation/tensorflow-2.6.4Copy head branch name to clipboard