add py312 support

[vppuzakov]

• remove legacy python support
• pin cython, pydantic, flask, aiohttp versions
• disable debug mode in coveralls
• fix mypy typing test

[colonelpanic8]

@vppuzakov if this doesnt get merged soon, i feel like we should consider forking so that we can maintain this somewhere.

@rmk135 do you have any intention to continue maintaining? if not you should really consider maybe handing over control to the community.

[vppuzakov]

@colonelpanic8, already create organization and fork repo

merged version published as dependency-injector2

[colonelpanic8]

@vppuzakov cool, but the repo doesn't actually have this changed merged in afaict

[korolenkowork]

Awesome work! It is so strange that it didn't merged yet