chore(deps): bump notebook in the uv group across 1 directory

Bumps the uv group with 1 update in the / directory: [notebook](https://github.com/jupyter/notebook).


Updates `notebook` from 7.5.5 to 7.5.6
- [Release notes](https://github.com/jupyter/notebook/releases)
- [Changelog](https://github.com/jupyter/notebook/blob/@jupyter-notebook/tree@7.5.6/CHANGELOG.md)
- [Commits](https://github.com/jupyter/notebook/compare/@jupyter-notebook/tree@7.5.5...@jupyter-notebook/tree@7.5.6)

---
updated-dependencies:
- dependency-name: notebook
  dependency-version: 7.5.6
  dependency-type: indirect
  dependency-group: uv
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]