Bump tensorflow from 1.14.0 to 2.9.3

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.14.0 to 2.9.3.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](https://github.com/tensorflow/tensorflow/compare/v1.14.0...v2.9.3)

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

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requirements.txt

@@ -7,7 +7,7 @@ ntplib==0.3.3
 sklearn
 opencv-python
 keras==2.2.4
-tensorflow==1.14.0
+tensorflow==2.9.3
 matplotlib>=3.0.2
 numpy>=1.14.6
 scipy>=1.1.0