Error with pydantic 2.9.x

[rmarquis]

Error in chapter 11:

AttributeError: module 'pydantic._internal._std_types_schema' has no attribute 'PREPARE_METHODS'

This happens due to the update of the pydantic transitive dependency, which happened on September 5.
Indeed, we don't have full control of transitive dependency in the guide, as we teach how to freeze dependencies to avoid unwanted breakage.

However, we don't have guarantees that the guide itself will be in a full working state, as shown above.

A quick sorkaround is to pin pydantic to 2.8.2, as shown in bentoml/BentoML#4974. A more long term solution is to use bentoml.IODescriptor as shown in bentoml/BentoML#4975

A more general question arises: how do we ensure the ocntent of the guide stays in a full working state, without pre-doing the steps the readers are supposed to do?

[rmarquis]

The error hes been fixed in BentoML 2.3.6 through bentoml/BentoML#4960

We'll handle the more general question in a separate ticket.