Bump opencv-python-headless from 4.11.0.86 to 4.12.0.88 in /docs

---
updated-dependencies:
- dependency-name: opencv-python-headless
  dependency-version: 4.12.0.88
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

docs/requirements.txt

@@ -3,7 +3,7 @@ sphinx-book-theme>=1.0.1
 sphinx-click==6.0.0
 myst_parser==4.0.0
 ghostscript==0.8.1
-opencv-python-headless==4.11.0.86
+opencv-python-headless==4.12.0.88
 matplotlib==3.10.1
 accessible-pygments==0.0.5
 pydata-sphinx-theme==0.16.1