Update jupyter-core requirement from ~=5.5.0 to ~=5.6.0

Updates the requirements on [jupyter-core](https://github.com/jupyter/jupyter_core) to permit the latest version.
- [Release notes](https://github.com/jupyter/jupyter_core/releases)
- [Changelog](https://github.com/jupyter/jupyter_core/blob/main/CHANGELOG.md)
- [Commits](jupyter/jupyter_core@v5.5.0...v5.6.0)

---
updated-dependencies:
- dependency-name: jupyter-core
  dependency-type: direct:production
...

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

requirements.txt

@@ -61,7 +61,7 @@ Jinja2~=3.1.2
 jsonpointer==2.4
 jsonschema~=4.20.0
 jupyter-client~=8.6.0
-jupyter-core~=5.5.0
+jupyter-core~=5.6.0
 jupyterlab-pygments==0.3.0
 jupyterlab-widgets~=3.0.3
 kiwisolver~=1.4.4