Bump opencv-python in /DataScience/cnn_modeling

Bumps [opencv-python](https://github.com/opencv/opencv-python) from 4.6.0.66 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
...

Signed-off-by: dependabot[bot] <[email protected]>

DataScience/cnn_modeling/requirements.txt

@@ -118,7 +118,7 @@ onnx2keras==0.0.24
     # via -r requirements.in
 onnxruntime==1.12.1
     # via -r requirements.in
-opencv-python==4.6.0.66
+opencv-python==4.8.1.78
     # via -r requirements.in
 opt-einsum==3.3.0
     # via tensorflow