Bump nbformat from 5.9.1 to 5.9.2

Bumps [nbformat]() from 5.9.1 to 5.9.2.

---
updated-dependencies:
- dependency-name: nbformat
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]