Will need to advice people to use --namespace-packages for Mypy.

The README in this project reads:

Note that if you're using Mypy you need to use the --namespace-packages option as google and some of its subpackages are namespace packages.

I wanted to bring up that the warning above may have to be updated somehow given that googleapis-common-protos v1.62.0 has been migrated to native namespace packages. Related issue: googleapis/python-api-common-protos#187.

For me this change caused this error when running mypy after the upgrade:

error: Module "google.rpc" has no attribute "code_pb2"  [attr-defined]

I had to make this change to fix it:

[tool.mypy]
-namespace_packages = true
+namespace_packages = false

Thank you for this project, @henribru!