Bump opencv-python-headless from 4.8.0.76 to 4.8.1.78

Bumps [opencv-python-headless](https://github.com/opencv/opencv-python) from 4.8.0.76 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-headless
dependency-type: direct:production
update-type: version-update:semver-patch
...

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

requirements.txt

@@ -1,4 +1,4 @@
-opencv-python-headless==4.8.0.76
+opencv-python-headless==4.8.1.78
 pydub==0.25.1
 streamlit_webrtc==0.47.1
 twilio~=8.9.0