Bump opencv-python from 4.1.1.26 to 4.2.0.32 in /model-app

Bumps [opencv-python](https://github.com/skvark/opencv-python) from 4.1.1.26 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
...

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

Author: dependabot[bot]

model-app/requirements.txt

@@ -16,7 +16,7 @@ networkx==1.11
 numpy==1.17.1
 olefile==0.46
 onnx==1.6.0
-opencv-python==4.1.1.26
+opencv-python==4.2.0.32
 Pillow==6.2.2
 protobuf==3.10.0
 pytz==2019.3