Update dependency google-auth to v2.8.0

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
google-auth	==2.3.3 -> ==2.8.0

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Release Notes

googleapis/google-auth-library-python

v2.8.0

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Features

• add experimental GDCH support (#​1044) (94fb5e2)

v2.7.0

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Features

• add experimental enterprise cert support (#​1052) (dda7dda)
• add experimental GDCH support (#​1022) (5367aac)
• Pluggable auth support (#​995) (62daa73)

Bug Fixes

• validate urls for external accounts (#​1031) (61b1f15)

Reverts

• pluggable auth support #​995 (#​1039) (513d999)
• revert experimental GDCH support (#​1022) (#​1042) (c720995)

Documentation

• fix changelog header to consistent size (#​1046) (e64d084)

v2.6.6

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Bug Fixes

• silence TypeError during tear down stage (#​1027) (952a6aa)

v2.6.5

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Bug Fixes

• add additional missing import in _default.py (#​1018) (638331b)

v2.6.4

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Bug Fixes

• fix missing import in _default.py (#​1015) (63f4e38)

v2.6.3

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Bug Fixes

• change requests lib import place (#​1010) (c753c08)
• clean up HTTP session and pool during tear down phase (#​1007) (d057376)
• pin click version and update sys test creds (#​1008) (ae2804b)

v2.6.2

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Bug Fixes

• Rename aws imdsv2 url field and update token lifetime (#​982) (818e6d2)

Miscellaneous Chores

• let release-please finish the release (#​991) (d2bdc9a)

v2.6.0

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Features

• ADC can load an impersonated service account credentials. (#​962) (52c8ef9)

Bug Fixes

• revert "feat: add api key support (#​826)" (#​964) (f9f23f4)

v2.5.0

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Features

• ADC can load an impersonated service account credentials. (#​956) (a8eb4c8)

v2.4.1

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Bug Fixes

• urllib3 import (#​953) (c8b5cae)

v2.4.0

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Features

• add 'py.typed' declaration (#​919) (c993504)
• add api key support (#​826) (3b15092)

Bug Fixes

• deps: allow cachetools 5.0 for python 3.7+ (#​937) (1eae37d)
• fix the message format for metadata server exception (#​916) (e756f08)

Documentation

• fix intersphinx link for 'requests-oauthlib' (#​921) (967be4f)
• note ValueError in verify_oauth2_token (#​928) (82bc5f0)

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