Bump tensorflow from 2.6.2 to 2.6.3 in /tests (#665)

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.6.2 to 2.6.3.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/master/RELEASE.md)
- [Commits](tensorflow/tensorflow@v2.6.2...v2.6.3)

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

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tests/requirements.txt

@@ -1,7 +1,7 @@
 torch==1.10.1
 torchvision==0.11.2
 jax[cpu]==0.2.17
-tensorflow==2.6.2
+tensorflow==2.6.3
 numba==0.55.1
 matplotlib==3.5.1
 pillow==9.0.0