build(py37): remove support of py37

[manawasp]

Hey,

• Dropped support for py37 and lower
• Added python 3.12 in supported version as there is the CI running test on it

_There is still some code related to py36 (ex: _py36_maybe_unwrap_GenericMeta) but I prefer to to go small and provide other PR to be more comfortable with the code base._

Btw, do you know why the test dir is named t ?

[wbarnha]

Hey,

* Dropped support for py37 and lower

* Added python 3.12 in supported version as there is the CI running test on it

_There is still some code related to py36 (ex: _py36_maybe_unwrap_GenericMeta) but I prefer to to go small and provide other PR to be more comfortable with the code base._

Thanks for the PR! I'll give this a closer look but most of the changes seem to be okay for the most part.

Btw, do you know why the test dir is named t ?

Nope. Probably a typo, I've always felt that if it's not broken, I don't touch it. :smile: