chore: Drop pytest-mypy-plugin from [dev] extras

Static tests intended to be removed in future

Author: abelcheung

pyproject.toml

@@ -48,7 +48,6 @@ dev = [
     'pook >= 2.0',
     'urllib3 >= 2.0',
     "pytest >= 7.0, < 9",
-    'pytest-mypy-plugins >= 3.2.0',
     'pytest-revealtype-injector >= 0.9.0',
     'lxml >= 5.0',
     'rnc2rng',