Remove stac-pydantic dependency

[gadomski]

stac-pydantic is unmaintained and lags well behind the STAC specification. We should remove our dependency on that package.

Alternatively, stac-pydantic could be brought up-to-date with the current STAC spec and pydantic v2. This would be more work.

[iliion]

i do not know if this is related , but i have the feeling it might be.
I get import errors with the latest library

Traceback (most recent call last):
  File "/home/..../stac_fastapi/elasticsearch/app.py", line 6, in <module>
    from stac_fastapi.api.models import create_get_request_model, create_post_request_model
  File "/home/.../.venv/lib/python3.8/site-packages/stac_fastapi/api/models.py", line 9, in <module>
    from pydantic.fields import UndefinedType
ImportError: cannot import name 'UndefinedType' from 'pydantic.fields' (/home/vagrant/Desktop/repos/data-downloaders/srs_download/.venv/lib/python3.8/site-packages/pydantic/fields.py)

Are there any constraints in package versions in order to make this work? whatever i do i get the above error

FYI
"stac_pydantic==2.0.3",
"stac-fastapi.types==2.4.8",
"stac-fastapi.api==2.4.8",
"stac-fastapi.extensions==2.4.8",

[thomas-maschler]

It would be great if someone could review stac-utils/stac-pydantic#127. I am happy to make further changes if necessary.

[vincentsarago]

in 3.0 we will still depends on stac-pydantic and it seems this will continue.

I'm going to closes this issue for now