chore(deps): update dependency google-auth to v1.18.0

[renovate-bot]

This PR contains the following updates:

Package	Update	Change
google-auth	minor	==1.14.0 -> ==1.18.0

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Release Notes

googleapis/google-auth-library-python

v1.18.0

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Features

• make load_credentials_from_file a public method (#​530) (15d5fa9)

Bug Fixes

• no warning if quota_project_id is given (#​537) (f30b45a)

1.17.2 (2020-06-12)

Bug Fixes

• dependencies: Further restrict RSA versions (#​532) (46677a0), closes #​528

1.17.1 (2020-06-11)

Bug Fixes

• narrow acceptable RSA versions to maintain Python 2 compatability (#​528) (9434868)

v1.17.2

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v1.17.1

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v1.17.0

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Features

• add quota_project_id to service accounts; add with_quota_project methods (#​519) (b12488c)

1.16.1 (2020-06-04)

Bug Fixes

• fix impersonated cred exception doc (#​521) (9d5a9a9)
• replace environment variable GCE_METADATA_ROOT with GCE_METADATA_HOST (#​433) (8ffb4d3), closes #​339

v1.16.1

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v1.16.0

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Features

• add helper func to for default encrypted cert (#​514) (f282aa4)

Bug Fixes

• fix impersonated cred for gcloud (#​516) (eb7be3f)

v1.15.0

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Features

• encrypted mtls private key support (#​496) (9dc9e9f)

Bug Fixes

• signBytes for impersonated credentials (#​506) (ca8d98a), closes #​338

1.14.3 (2020-05-11)

Bug Fixes

• catch exceptions.RefreshError (#​508) (3d672e9)

1.14.2 (2020-05-07)

Bug Fixes

• support string type response.data (#​504) (9b7228e)

1.14.1 (2020-04-21)

Bug Fixes

• support es256 raw format signature (#​490) (cf2c0a9)

v1.14.3

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v1.14.2

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v1.14.1

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