Bump opencv-python from 4.4.0.42 to 4.8.1.78 in /examples/research_projects/lxmert (#33227)
Bump opencv-python in /examples/research_projects/lxmert
Bumps [opencv-python](https://github.com/opencv/opencv-python) from 4.4.0.42 to 4.8.1.78.
- [Release notes](https://github.com/opencv/opencv-python/releases)
- [Commits](https://github.com/opencv/opencv-python/commits)
---
updated-dependencies:
- dependency-name: opencv-python
dependency-type: direct:production
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