Update dependency google-auth to v1.25.0

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-auth	==1.21.0 -> ==1.25.0

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Release Notes

googleapis/google-auth-library-python

v1.25.0

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Features

• support self-signed jwt in requests and urllib3 transports (#​679) (7a94acb)
• use self-signed jwt for service account (#​665) (bf5ce0c)

v1.24.0

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Features

• add Python 3.9 support, drop Python 3.5 support (#​655) (6de753d), closes #​654

Bug Fixes

• avoid losing the original '_include_email' parameter in impersonated credentials (#​626) (fd9b5b1)

Documentation

• fix typo in import (#​651) (3319ea8), closes #​650

v1.23.0

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Features

• Add custom scopes for access tokens from the metadata service (#​633) (0323cf3)

Bug Fixes

• deps: Revert "fix: pin 'aoihttp < 3.7.0dev' (#​634)" (#​632) (#​640) (b790e65)
• pin 'aoihttp < 3.7.0dev' (#​634) (05f9524)
• remove checks for ancient versions of Cryptography (#​596) (6407258), closes /github.com/googleapis/google-auth-library-python/issues/595#issuecomment-683903062

1.22.1 (2020-10-05)

Bug Fixes

• move aiohttp to extra as it is currently internal surface (#​619) (a924011), closes #​618

v1.22.1

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v1.22.0

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Features

• add asyncio based auth flow (#​612) (7e15258), closes #​572

1.21.3 (2020-09-22)

Bug Fixes

• fix expiry for to_json() (#​589) (d0e0aba), closes /github.com/googleapis/oauth2client/blob/master/oauth2client/client.py#L55

1.21.2 (2020-09-08)

Bug Fixes

• migrate signBlob to iamcredentials.googleapis.com (#​600) (694d83f)

1.21.1 (2020-09-03)

Bug Fixes

• dummy commit to trigger a auto release (#​597) (d32f7df)

v1.21.3

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v1.21.2

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v1.21.1

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