fix(issue-89): workaround for unmarshalling-strings issue

[jandoerntlein]

Found a workaround to fix the issue... give it a try. Could not find the root-cause yet. Fixes https://github.com/rashadphz/farfalle/issues/89 by reducing the strictness of the pydantic validation of the litellm output (part 1), detecting the workaround later and resolving it for the rest of the later pipeline (part 2).

Also fixed a warning for protected_namespaces.

Possibly also fixing https://github.com/rashadphz/farfalle/issues/59? Could not reproduce.