Update CI and package management

[renecotyfanboy]

Hi @Samreay, I hope your parental leave is going well :)
I've just updated some dependencies, and I think it would be good to clear a bit the package management for chainconsumer. We have 3 files here to define the dependencies, while the pyproject.toml could unify everything.
Also, it might be a good idea to add a Github action to deploy CC to pypi when new tags are released, it could smooth a bit the deployment of new versions.
WDYT ?