🦉 Updates from OwlBot

See https://github.com/googleapis/repo-automation-bots/blob/main/packages/owl-bot/README.md

noxfile.py

@@ -85,12 +85,9 @@ def pytype(session):
 def mypy(session):
     """Verify type hints are mypy compatible."""
     session.install("-e", ".")
-    session.install(
-        "mypy", "types-setuptools", "types-protobuf", "types-dataclasses", "types-mock",
-    )
-    # Note: getenerated tests (in 'tests/unit/gapic') are not yet
-    # mypy-safe
-    session.run("mypy", "google/", "tests/unit/v1/", "tests/system/")
+    session.install("mypy", "types-setuptools")
+    # TODO: also verify types on tests, all of google package
+    session.run("mypy", "-p", "google.cloud.firestore", "--no-incremental")
 
 
 @nox.session(python=DEFAULT_PYTHON_VERSION)