Update to pydantic 2.0

[mariusvniekerk]

Closes #472

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[maresb]

Are you sure we want to do this already?

The Pydantic v2 migration seems like a rough edge. I think this might make it a lot harder for people to install conda-lock in their base environments.

[maresb]

Maybe we should instead suppress the warnings for a bit?

[maresb]

In light of #462 I think this should be fine.

I'm just mildly concerned because I don't understand the effect of removing

json_encoders = {frozenset: list}

[maresb]

I think this deserves its own release

[maresb]

@mariusvniekerk, this is marked as draft, but I think it may be ready to merge?

[mariusvniekerk]

Yeah just left it as draft so that we can land whatever we want before landing this breaking dependency

[maresb]

@mariusvniekerk it looks like I forgot to provide this explanation:

The required new functionality exists in Pydantic 1.10, so pinning >=2 isn't even necessary. I already added a commit in this branch to relax the pin to >=1.10. I tested the changes in #462 by pinning pydantic <2.

That should be fine, right?