"3rd party" dependency pyu2f is discontinued, use Yubico/python-fido2 instead…

The https://github.com/google/pyu2f README states:

> Support for pyu2f library is discontinued, because U2F is an outdated FIDO spec. In favor of embracing FIDO2 and more secure protocols, [Yubico/python-fido2](https://github.com/Yubico/python-fido2) is recommended, which also has backward compatible support for U2F.

Already noted in https://github.com/GoogleCloudPlatform/gsutil/pull/1870, too…

Right now, using macOS Tahoe (and the previous version, too), I regularly see

`ModuleNotFoundError: No module named 'range'`

Editing `google-cloud-sdk/platform/gsutil/third_party/pyu2f/pyu2f/hid/macos.py` to remove the line `import range` makes it work, which is expected – `range` is a Python builtin. Anyway, fixing that is not an option, given the discontnued state…

So, please follow the advice of using [Yubico/python-fido2](https://github.com/Yubico/python-fido2) instead.

Start by reading the gsutil dependency layout and google-cloud-sdk/platform/gsutil/third_party/pyu2f/pyu2f/hid/macos.py, then compare the discontinued pyu2f README with Yubico/python-fido2. Trace where gsutil imports or uses pyu2f and verify the macOS U2F workflow after the dependency migration; done means pyu2f is no longer required and the reported ModuleNotFoundError is resolved.

Written by the indexing model from the issue text.