Migrate to pyproject.toml and update Python versions to 3.9 and 3.10#8

jordic merged 2 commits intojordic:masterjordic/fastapi_asyncpg:masterfrom

pydanny:modernize-tooling-plus-python-version-changespydanny/fastapi_asyncpg:modernize-tooling-plus-python-version-changesCopy head branch name to clipboard