Update to Pydantic > 2.0

[shufflebits]

Resolves #276

• modified: fastapi_utils/api_model.py

  • New-style class config.

• modified: fastapi_utils/api_settings.py

  • New-style class config.

• modified: fastapi_utils/cbv.py

  • is_classvar is gone, now we use Python>=3.8 tools to check for class vars.

• modified: poetry.lock

  • Update codecov to 2.0.13
  • I don't really understand this :-)

• modified: pyproject.toml

  • Update Pydantic

• modified: requirements.txt

  • Update Pydantic, fastAPI, codecov

• modified: tests/test_api_model.py

  • from_orm() is now model_validate()

• modified: tests/test_inferring_router.py

  • OpenAPI version is newer.