chore: targeting python 3.12 in CI

[jamagalhaes]

@beaugunderson did a small test in CI with py3.11

poetry run python ./test_build_dist.py

from semantic_release.cli.commands.version import build_distributions

build_distributions("poetry build")

and it worked.

I believe this was probably related with the cache. I've improved the cache keys for venv and poetry

[beaugunderson]

should we stick with 3.11 or move forward to 3.12 regardless? GitHub is now enforcing 3.12 in their runners, and we've already had one compatibility issue that @andhines ran into trying to do pip install canvas on his local machine (which had 3.12 installed)

[jamagalhaes]

@beaugunderson done