GitHub action to generate API fails due to wrong imports

[haeussma]

Description

Using the Github action to generate a Python API based on the markdown specifications fails, due to a wrong import.
Generating the API by calling generate_python_api() works as expected.

See failed Action

Issue

Might only result from the recent Pydantic update to v.2. Some classes were renamed or are not supported anymore.

[JR-1991]

I added PR #35 to solve this in the long term. There are a lot of changes that need careful refactoring of the code base. For now, we'd require pydantic <= 1.10.11 to keep the functionality