Pydantic v2 compatibility

[codecov[bot]]

Codecov Report

Merging #119 (bb9062b) into master (48c097a) will decrease coverage by 0.7%. The diff coverage is 78.5%.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #119 +/- ## ======================================== - Coverage 98.5% 97.9% -0.7% ======================================== Files 8 8 Lines 427 441 +14 ======================================== + Hits 421 432 +11 - Misses 6 9 +3 ``` | [Impacted Files](https://app.codecov.io/gh/drivendataorg/nbautoexport/pull/119?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=drivendataorg) | Coverage Δ | | |---|---|---| | [nbautoexport/sentinel.py](https://app.codecov.io/gh/drivendataorg/nbautoexport/pull/119?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=drivendataorg#diff-bmJhdXRvZXhwb3J0L3NlbnRpbmVsLnB5) | `95.9% <75.0%> (-4.1%)` | :arrow_down: | | [nbautoexport/utils.py](https://app.codecov.io/gh/drivendataorg/nbautoexport/pull/119?src=pr&el=tree&utm_medium=referral&utm_source=github&utm_content=comment&utm_campaign=pr+comments&utm_term=drivendataorg#diff-bmJhdXRvZXhwb3J0L3V0aWxzLnB5) | `98.6% <83.3%> (-1.4%)` | :arrow_down: |

[pjbull]

Auto-running was disabled because of lack of repo activity(?), here's the test run: https://github.com/drivendataorg/nbautoexport/actions/runs/5503874277

[github-actions[bot]]

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