Newest Pydantic generates error for some files

[rd-andreas-tollkoetter]

Describe the bug
Huge error caused by Pydantic; too huge for my terminal to contain, so I can't copy it here.

PydanticUserError: `Parameter` is not fully defined; you should define `Header`, then call `Parameter.model_rebuild()`.

OpenAPI Spec File
catalog_database_registration_v1.yaml.zip

Desktop (please complete the following information):

• OS: macOS 14.6
• Python Version: 3.12.7
• openapi-python-client version 0.21.7

Additional context
This is new in v0.21.7 and does not happen in v0.21.6.

[rd-andreas-tollkoetter]

After doing some more experiments, I found that this is not caused by openapi-python-client itself but by Pydantic 2.10 (instead of 2.9). So it is unclear whether this is a new feature in Pydantic that now reports some before hidden error, or a bug in Pydantic that will be fixed.

[texhnolyze]

This is also discussed in: #1171

[dbanty]

It was a breaking change in Pydantic. #1176 adapts to it, though