fix: updates should include universal2 Pythons (#573)

* fix: updates should include universal2 Pythons

* refactor: rename to macos_cpython

.pre-commit-config.yaml

@@ -21,7 +21,6 @@ repos:
   hooks:
   - id: black
     files: ^bin/update_pythons.py$
-    args: ["--line-length=120"]
 
 - repo: https://github.com/pre-commit/mirrors-mypy
   rev: v0.800
@@ -29,6 +28,7 @@ repos:
   - id: mypy
     exclude: ^(bin/|cibuildwheel/resources/).*py$
     additional_dependencies: [packaging]
+    args: ["--python-version=3.6", "--ignore-missing-imports", "--scripts-are-modules"]
   - id: mypy
     name: mypy 3.7+ on bin/
     files: ^bin/.*py$