chore(deps): bump opencv-python in /backend-api

Bumps [opencv-python](https://github.com/opencv/opencv-python) from 4.12.0.88 to 4.13.0.92.
- [Release notes](https://github.com/opencv/opencv-python/releases)
- [Commits](https://github.com/opencv/opencv-python/commits)

---
updated-dependencies:
- dependency-name: opencv-python
  dependency-version: 4.13.0.92
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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Author: dependabot[bot]

backend-api/pyproject.toml

@@ -33,7 +33,7 @@ dependencies = [
 evidence = [
     "pytesseract>=0.3.10",
     "pillow>=12.2.0",
-    "opencv-python>=4.10.0.84",
+    "opencv-python>=4.13.0.92",
     "python-docx>=1.1.2",
     "docx2pdf>=0.1.8",
     "pymupdf>=1.24.10",