Bump nbconvert from 7.11.0 to 7.13.1 (#71)

Bumps [nbconvert](https://github.com/jupyter/nbconvert) from 7.11.0 to 7.13.1.
- [Release notes](https://github.com/jupyter/nbconvert/releases)
- [Changelog](https://github.com/jupyter/nbconvert/blob/main/CHANGELOG.md)
- [Commits](jupyter/nbconvert@v7.11.0...v7.13.1)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>