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Hey folks is anyone else getting a deprecation warning on marshmallow? Something like:
```...
/home/rof/.pyenv/versions/3.9.1/lib/python3.9/site-packages/marshmallow/fields.py:198
/home/rof/.pyenv/versions/3.9.1/lib/python3.9/site-packages/marshmallow/fields.py:198: RemovedInMarshmallow4Warning: Passing field metadata as a keyword arg is deprecated. Use the explicit `metadata=...` argument instead.
...```
Tried to update to the latest version of prefect and still no joy!

Yes, I suppose some changes in the usage still needs to be performed

Hi <@U01A5UMH7HT>! I’ll bring this up to the team.

Do you have a simple flow to reproduce this and what is your Prefect version?

Can you try with Python 3.8 as well because 3.9 is experimental?

Hey Kevin, I’ve seen this on Python 3.8 when using `prefect.utilities.debug.is_serializable` from pytest.

<@ULVA73B9P> open “Marshmallow Deprecation Warning”

<https://github.com/PrefectHQ/prefect/issues/4540>