Masked spurious mypy error on setup.py

Author: jmfernandez

setup.py

@@ -147,7 +147,7 @@ def populate_extra_requirements(
         ],
     },
     install_requires=requirements,
-    extras_require=extra_requirements,
+    extras_require=extra_requirements,  # type: ignore[arg-type]
     # See https://pypi.org/classifiers/
     classifiers=[
         "Programming Language :: Python :: 3",