release 3.1 or 4.0?

[vincentsarago]

We've recently pushed some changes to main which are worth a new release

stac-pydantic/CHANGELOG.txt

Lines 1 to 7 in f682826

	3.1.0 (TBD)
	-----------------
	- Remove the deprecated `Context` extension (#138, @vincentsarago)
	- Rename `stac_pydantic.api.conformance.ConformanceClasses` to `stac_pydantic.api.conformance.Conformance`
	- Update pre-commit configuration and switch to astral-sh/ruff for linter and formater
	- Add official support for python 3.12
	- Enforce required `type` key for `Collection` and `Catalog` models

☝️ contains some almost breaking changes, but better match the specification so I'm not sure we want to go for a new Major version (cc @gadomski @jonhealy1)

We also have #131 and #135 which should be merged before doing new releases.

[gadomski]

My instinct is to not go breaking, at least based on that changelog -- the only one that might be breaking-ish is the enforcing the required type, but as you say that's just bringing in line w/ spec. I'm 👍🏼 for v3.1.0.