Bump opencv-python from 4.7.0.68 to 4.8.1.78

Bumps [opencv-python](https://github.com/opencv/opencv-python) from 4.7.0.68 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]>

requirements.txt

@@ -37,7 +37,7 @@ mdurl==0.1.2
 multidict==6.0.5
 numpy==1.26.4
 oauthlib==3.2.2
-opencv-python==4.7.0.68
+opencv-python==4.8.1.78
 openpyxl==3.0.9
 orjson==3.10.6
 packaging==23.2