CHORE: Bump nbconvert from 7.16.4 to 7.16.6

Bumps [nbconvert](https://github.com/jupyter/nbconvert) from 7.16.4 to 7.16.6.
- [Release notes](https://github.com/jupyter/nbconvert/releases)
- [Changelog](https://github.com/jupyter/nbconvert/blob/main/CHANGELOG.md)
- [Commits](jupyter/nbconvert@v7.16.4...v7.16.6)

---
updated-dependencies:
- dependency-name: nbconvert
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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