Build requirements are too strict #147

I'd like to package pytest-mypy for OpenIndiana, but it is very hard to do so because build requirements for pytest-mypy are these (from pyproject.toml):

[build-system]
requires = ['setuptools ~= 50.3.0', 'setuptools-scm[toml] ~= 5.0.0', 'wheel ~= 0.36.0']
build-backend = 'setuptools.build_meta'

The latest acceptable versions of required tools are about two years old now.

Could you please update pytest-mypy to relax its build requirements?

Thank you.