py-nbformat: updated to 5.9.2

5.9.2

Bugs fixed

- Fix version handling

Maintenance and upkeep improvements

- Fix encoding warnings
- Update link to notebook security

Documentation improvements

- Update link to notebook security

5.9.1

Maintenance and upkeep improvements

- Fix deprecation warning when importing from jsonschema

5.9.0

Maintenance and upkeep improvements

- Support Python 3.12
- Use local coverage
- Bump actions/checkout from 2 to 3

(adam)