Nbautoexport

- Fixes compatibility with Notebook 7. ([PR 122](https://github.com/drivendataorg/nbautoexport/pull/122))

- Add support for `pydantic>=2.0.0` ([PR 119](https://github.com/drivendataorg/nbautoexport/pull/119))

- Removes support for Python 3.6.
- Removes explicit dependency on `pywinpty` for Windows environments.

This will be the last version of `nbautoexport` that will have been tested on and officially support Python 3.6.

- Adds dependency on `pywinpty` for Windows environments with a version ceiling on the last version that works with Python 3.6. ([Issue 90](https://github.com/drivendataorg/nbautoexport/issues/90), [PR #92](https://github.com/drivendataorg/nbautoexport/issues/92))

- Logging improvements. ([Issue 74](https://github.com/drivendataorg/nbautoexport/issues/74), [PR #80](https://github.com/drivendataorg/nbautoexport/pull/80))
- Adds additional log statements during post-save hook initialization and execution to facilitate debugging.
- Changes runtime errors in post-save hook to be caught gracefully instead of interrupting user with an alert dialog in the Jupyter UI.
- Adds logging integration with active Jupyter applications. Logs will use Jupyter formatting.
- Changes `--verbose`/`-v` flag to work as a counter. `-v` will set log level to INFO, and `-vv` will set log level to `DEBUG`.

- Remove extraneous dependency on `jupyter_contrib_nbextensions`. Add `traitlets`, `notebook`, `jupyter_core`, and `nbformat` as explicit dependencies; previously they were treated as transitive dependencies even though they are actually direct dependencies. ([Issue 68](https://github.com/drivendataorg/nbautoexport/issues/68))