Update dependency google-auth to v2.11.0

This MR contains the following updates:

Package	Update	Change
google-auth	minor	==2.6.6 -> ==2.11.0

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Release Notes

googleapis/google-auth-library-python

v2.11.0

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Features

• add integration tests for configurable token lifespan (#​1103) (124bae6)

Bug Fixes

• Async certificate retrieving (#​1101) (05f125d)

v2.10.0

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Features

• add integration tests for pluggable auth (#​1073) (f8d776a)
• support for configurable token lifetime (0dc6a9a)
• support for configurable token lifetime (#​1079) (0dc6a9a)

Bug Fixes

• async certificate decoding (#​1085) (741c6c6)
• Async system tests were not unwrapping async_generators (#​1086) (29d248a)
• Fix IDTokenCredentials update bug (#​1072) (b62c25c)
• make expiration_time optional in response schema (#​1091) (032fb8d)
• refactor credential subclass parameters (#​1095) (8d15f69)

v2.9.1

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Bug Fixes

• there was a raise missing for throwing exceptions (#​1077) (d1f17b0)

v2.9.0

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Features

• pluggable auth support (#​1045) (de14f4e)

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)

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