Bump opencv-python from 4.5.5.64 to 4.8.1.78 in /test_tipc

Bumps [opencv-python](https://github.com/opencv/opencv-python) from 4.5.5.64 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] <support@github.com>

test_tipc/requirements.txt

@@ -3,7 +3,7 @@ yapf == 0.26.0
 flake8
 pyyaml >= 5.1
 visualdl >= 2.0.0
-opencv-python == 4.5.5.64
+opencv-python == 4.8.1.78
 tqdm
 filelock
 scipy