Bump tensorflow from 1.12.2 to 2.5.1 in /Tools/WinMLDashboard/public

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.12.2 to 2.5.1.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v1.12.2...v2.5.1)

---
updated-dependencies:
- dependency-name: tensorflow
  dependency-type: direct:production
...

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Author: dependabot[bot]

Tools/WinMLDashboard/public/requirements.txt

@@ -2,7 +2,7 @@ coremltools_windows==2.0b1
 onnxmltools==1.7.0
 onnxconverter-common==1.7.0
 h5py==2.8.0
-tensorflow==1.12.2
+tensorflow==2.5.1
 tf2onnx==1.7.2
 Keras==2.2.4
 Keras-Applications==1.0.6