Add support for mypy v0.910

• https://mypy-lang.blogspot.com/2021/06/mypy-0910-released.html
• https://mypy-lang.blogspot.com/2021/06/mypy-0900-released.html

With pyproject configuration support. Move option to the configuration

https://mypy.readthedocs.io/en/stable/config_file.html?highlight=pyproject#using-a-pyproject-toml-file

• Update to v0.910 in pyproject.toml and .pre-commit-config.yml

Install mypy attrs stubs to check types classes

Mypy v0.900 no longer install additional stubs by default Third-party Library Stubs in Stub Packages (Breaking Change)

attrs for duniterpy.documents.ws2p.heads