exclude_default is ignored on Pydantic model from the second call

[zhavir]

Describe the bug If you try to get avro schema from a pydantic model multiple times it starts ignoring the exclude_default feature

To Reproduce

import uuid
from dataclasses_avroschema.pydantic import AvroBaseModel
from pydantic import Field

class Test(AvroBaseModel):
    id: str = Field(  # type: ignore[call-arg]
        default_factory=lambda: str(uuid.uuid4()), metadata={"exclude_default": True}
    )

a = Test()
print(a.avro_schema())  # it's works as expected
print(a.avro_schema())  # it's not works as expected and the defaults are included inside the schema

as a workaround I've overridden the method avro_schema by putting the cache decorator

    @classmethod
    @cache
    def avro_schema(cls, case_type: Any = None, **kwargs: Any) -> str:
        return super().avro_schema(case_type=case_type, **kwargs)

Expected behavior It should always exclude the default

[marcosschroh]

I will take a look. Thanks for reporting it