Bump opencv-contrib-python from 3.4.2.17 to 4.2.0.32 in /benchmark

Bumps [opencv-contrib-python](https://github.com/skvark/opencv-python) from 3.4.2.17 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-contrib-python
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>
(cherry picked from commit 33a749f)
(cherry picked from commit 22b60a5)

Author: dependabot[bot]

benchmark/requirements.txt

@@ -1,3 +1,3 @@
 numpy
 matplotlib
-opencv-contrib-python==3.4.2.17
+opencv-contrib-python==4.2.0.32