Bump opencv-python-headless from 4.6.0.66 to 4.7.0.68 (#170)

Bumps [opencv-python-headless](https://github.com/opencv/opencv-python) from 4.6.0.66 to 4.7.0.68.
- [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-minor
...

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Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -6,4 +6,4 @@ pytest-cov==4.0.0
 surrogate==0.1
 requests==2.28.1
 types-requests==2.28.11.7
-opencv-python-headless==4.6.0.66
+opencv-python-headless==4.7.0.68