google-auth: reauth: uses deprecated u2f module

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Summary of the issue

The reauth extension of google-auth uses pyu2f but pyu2f is discontinued and suggests using Yubico/python-fido2 instead, which has backwards compatible support for U2F.

Please switch to that library. Thank you!

(This was previously reported as #15168 but closed without a fix. The problem is still there.)

API client name and version

google-auth 2.53.0 and git head

Reproduction steps: code

Code reading.

Reproduction steps: supporting files

n/a

Reproduction steps: actual results

n/a

Reproduction steps: expected results

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OS & version + platform

all

Python environment

all

Python dependencies

n/a

Additional context

No response