Bump notebook from 7.0.4 to 7.0.7 in /examples

Bumps [notebook](https://github.com/jupyter/notebook) from 7.0.4 to 7.0.7.
- [Release notes](https://github.com/jupyter/notebook/releases)
- [Changelog](https://github.com/jupyter/notebook/blob/@jupyter-notebook/[email protected]/CHANGELOG.md)
- [Commits](https://github.com/jupyter/notebook/compare/@jupyter-notebook/[email protected]...@jupyter-notebook/[email protected])

---
updated-dependencies:
- dependency-name: notebook
  dependency-type: direct:production
...

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

examples/requirements_example.txt

@@ -1,4 +1,4 @@
 opencv-python>=4.1.0.25
-notebook==7.0.4
+notebook==7.0.7
 bbox-visualizer==0.1.0
 matplotlib==3.8.0