Remove support for pydantic < 2

[codecov[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

Project coverage is 100.00%. Comparing base (86e7248) to head (51c44fa).

Additional details and impacted files

```diff @@ Coverage Diff @@ ## v3.0.0 #995 +/- ## ========================================= Coverage 100.00% 100.00% ========================================= Files 20 20 Lines 2944 2902 -42 ========================================= - Hits 2944 2902 -42 ```

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