Bump tensorflow from 2.7.0 to 2.9.2

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 2.7.0 to 2.9.2.
- [Release notes](https://github.com/tensorflow/tensorflow/releases)
- [Changelog](https://github.com/tensorflow/tensorflow/blob/v2.9.2/RELEASE.md)
- [Commits](https://github.com/tensorflow/tensorflow/compare/v2.7.0...v2.9.2)

---
updated-dependencies:
- dependency-name: tensorflow
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

requirements.txt

@@ -1,7 +1,7 @@
 numpy==1.21.4
 opencv-contrib-python-headless==4.1.2.30
 scipy==1.7.2
-tensorflow==2.7.0
+tensorflow==2.9.2
 colorama==0.4.4
 tqdm==4.62.3
 ffmpeg-python==0.2.0