Bump opencv-python in /jupyter-notebooks/use-cases/water-change (#365)

Bumps [opencv-python](https://github.com/opencv/opencv-python) from 4.4.0.44 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]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Matt Ballard <[email protected]>

Author: dependabot[bot]

jupyter-notebooks/use-cases/water-change/requirements.txt

@@ -1,7 +1,7 @@
 matplotlib==3.3.3
 numpy==1.19.2
-opencv-python==4.4.0.44
-requests==2.32.2
+opencv-python==4.8.1.78
+requests==2.24.0
 scikit-image==0.17.2
 scipy==1.5.4
 bokeh==2.2.3