Bump nbconvert from 7.11.0 to 7.12.0

Bumps [nbconvert](https://github.com/jupyter/nbconvert) from 7.11.0 to 7.12.0.
- [Release notes](https://github.com/jupyter/nbconvert/releases)
- [Changelog](https://github.com/jupyter/nbconvert/blob/main/CHANGELOG.md)
- [Commits](jupyter/nbconvert@v7.11.0...v7.12.0)

---
updated-dependencies:
- dependency-name: nbconvert
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

setup.py

@@ -36,7 +36,7 @@
         'pyiron_atomistics==0.3.7',
         'ipywidgets==8.1.1',
         'matplotlib==3.8.2',
-        'nbconvert==7.11.0',
+        'nbconvert==7.12.0',
         'nbformat==5.9.2',
         'numpy==1.26.0',
         'pandas==2.1.3',