Bump tensorflow-gpu from 1.12.0 to 2.9.3

Bumps [tensorflow-gpu](https://github.com/tensorflow/tensorflow) from 1.12.0 to 2.9.3.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v1.12.0...v2.9.3)

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

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Author: dependabot[bot]

requirements.txt

@@ -1,5 +1,5 @@
 numpy==1.13.3
-tensorflow-gpu==1.13.1
+tensorflow-gpu==2.9.3
 openbabel==2.4.1
 scipy==1.2.2
 scikit-learn==0.20.3