Update dependency google_auth to v2.2.0

This MR contains the following updates:

Package	Type	Update	Change
google_auth	ironbank-pypi	minor	2.1.0 -> 2.2.0

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Release Notes

googleapis/google-auth-library-python

v2.2.0

Compare Source

Features

• add support for workforce pool credentials (#​868) (993bab2)

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