Bump tensorflow from 1.15.2 to 2.9.3 in /legacy/openCV

Bumps [tensorflow](https://github.com/tensorflow/tensorflow) from 1.15.2 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@v1.15.2...v2.9.3)

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

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

legacy/openCV/requirements.txt

@@ -51,7 +51,7 @@ Send2Trash==1.5.0
 simplegeneric==0.8.1
 six==1.11.0
 tensorboard==1.11.0
-tensorflow==1.15.2
+tensorflow==2.9.3
 termcolor==1.1.0
 terminado==0.8.1
 testpath==0.4.2