revert(noxfile): Revert noxfile.py to state before 442929366e8c32de33572fcdbbb01d7cda1929cb

Author: shuoweil

noxfile.py

@@ -66,7 +66,8 @@
 
 UNIT_TEST_PYTHON_VERSIONS = ["3.9", "3.10", "3.11", "3.12", "3.13"]
 UNIT_TEST_STANDARD_DEPENDENCIES = [
-    "setuptools",
+    "mock",
+    "asyncmock",
     PYTEST_VERSION,
     "pytest-asyncio",
     "pytest-cov",
@@ -263,13 +264,12 @@ def unit_noextras(session):
     run_unit(session, install_test_extra=False)
 
 
-@nox.session(python="3.13")
+@nox.session(python=DEFAULT_PYTHON_VERSION)
 def mypy(session):
     """Run type checks with mypy."""
     # Editable mode is not compatible with mypy when there are multiple
     # package directories. See:
     # https://github.com/python/mypy/issues/10564#issuecomment-851687749
-    session.install("--index-url", "https://pypi.org/simple", "setuptools")
     session.install(".")
 
     # Just install the dependencies' type info directly, since "mypy --install-types"