Switch to pyproject.toml

[pietermarsman]

Feature request

A pyproject.toml is a new way of storing metadata for a Python project. It stores the name, description, urls and other package info. It also manages dependencies. It also manages a build system for the package. And it also supports custom sections for tools (mypy, black, etc.).

Since 2023 the usage of pyproject.toml is widely accepted and is preferred (source)