Bump opencv-python from 4.1.2.30 to 4.2.0.32 in /docker/training

Bumps [opencv-python](https://github.com/skvark/opencv-python) from 4.1.2.30 to 4.2.0.32.
- [Release notes](https://github.com/skvark/opencv-python/releases)
- [Commits](https://github.com/skvark/opencv-python/commits)

---
updated-dependencies:
- dependency-name: opencv-python
  dependency-type: direct:production
...

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Author: dependabot[bot]

docker/training/requirements.txt

@@ -50,7 +50,7 @@ networkx==2.8.6
 numpy==1.19.2
 oauthlib==3.2.0
 omegaconf==2.1.1
-opencv-python==4.1.2.30
+opencv-python==4.2.0.32
 opencv-python-headless==4.6.0.66
 packaging==21.3
 pandas==1.4.3