feat: Upgrade internal Pydantic use to v2. Thanks @KristinnVikar!

[KristinnVikar]

Inital changes required for Pydantic v2 support, both hand updating + bump pydantic

Blockers

• Incorrect ForwardRef class lookup in inherited models pydantic/pydantic#6742
  • Causes test_openapi / test_properties to fail
  • Fix should be included in Pydantic v2.1.0

Currently 14 2 out of 449 tests are failing, all of which are due to the issue above.

[KristinnVikar]

Local tests seem to be mostly working, only tests failing are GeneratorErrors, since Error messages have changed since Pydantic V1.

So I went about a different approach to roughly match the content of the GeneratorError instead of exact match (Since the Pydantic version is included in GeneratorError.detail)

[codecov]

Codecov Report

Merging #779 (4be69e1) into main (be5b306) will not change coverage.
The diff coverage is 100.00%.

@@            Coverage Diff            @@
##              main      #779   +/-   ##
=========================================
  Coverage   100.00%   100.00%           
=========================================
  Files           49        49           
  Lines         1971      1918   -53     
=========================================
- Hits          1971      1918   -53     

Files Changed	Coverage Δ
openapi_python_client/config.py	100.00% <100.00%> (ø)
openapi_python_client/parser/openapi.py	100.00% <100.00%> (ø)
..._python_client/parser/properties/model_property.py	100.00% <100.00%> (ø)
...lient/schema/openapi_schema_pydantic/components.py	100.00% <100.00%> (ø)
...n_client/schema/openapi_schema_pydantic/contact.py	100.00% <100.00%> (ø)
...nt/schema/openapi_schema_pydantic/discriminator.py	100.00% <100.00%> (ø)
..._client/schema/openapi_schema_pydantic/encoding.py	100.00% <100.00%> (ø)
...n_client/schema/openapi_schema_pydantic/example.py	100.00% <100.00%> (ø)
.../openapi_schema_pydantic/external_documentation.py	100.00% <100.00%> (ø)
...on_client/schema/openapi_schema_pydantic/header.py	100.00% <100.00%> (ø)
... and 19 more

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[KristinnVikar]

Did some minor fixes with missing default in Field & schema ordering. Running it on the project I'm using this tool for seems to work just fine as of this last commit!

Hoping someone else can test it as well to see if there's any issues I need to fix!

[johnthagen]

Thanks for this @KristinnVikar! Just wanted to drop a link to some thoughts I had written on another thread about the motivation for this change

• chore(deps): update dependency pydantic to v2 #776 (comment)

[jpoppe]

Hoping someone else can test it as well to see if there's any issues I need to fix!

For what it's worth, I have tested it for my use cases and did not encounter any issues :)

[dbanty]

Thanks so much for doing this!