Bump opencv-python in the pip group across 1 directory

Bumps the pip group with 1 update in the / directory: [opencv-python](https://github.com/opencv/opencv-python).


Updates `opencv-python` from 4.5.1.48 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
  dependency-group: pip
...

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

Author: dependabot[bot]

requirements.txt

@@ -44,7 +44,7 @@
     nuscenes-devkit==1.1.2
     objgraph==3.5.0
     opencv-contrib-python-headless==4.8.1.78
-    opencv-python==4.5.1.48
+    opencv-python==4.8.1.78
     pandas==1.2.3
     pathspec==0.8.1
     patsy==0.5.1