Refs #595 (comment) 

I see no point in checking whether someone is running a version of https://github.com/pyca/cryptography/ from 2014 that doesn't even compile against modern versions of OpenSSL anymore.

Part of #579 

This helper is used with '?recursive=true' in one place, and can now be used by
IDTokenCredentials for requests with query parameters to the metadata identity
end-point.

This change will allow making requests to the token end-point with '?scopes=..'
query parameters.

Working around breaking change in 3.7.0.  See:

pnuckowski/aioresponses#173

…h) (#578)

* feat(python-library): changes to docs job

* feat(python-library): changes to docs job

* migrate to Trampoline V2
* add docs-presubmit job
* create docfx yaml files and upload them to another bucket

* remove redundant envvars

* add a failing test first

* fix TemplateSyntaxError: Missing end of comment tag

* serving_path is not needed any more

* use `raw` to make jinja happy

Source-Author: Takashi Matsuo <tmatsuo@google.com>
Source-Date: Thu Jul 30 12:44:02 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 5dfda5621df45b71b6e88544ebbb53b1a8c90214
Source-Link: googleapis/synthtool@5dfda56

* fix(python-library): add missing changes

Source-Author: Takashi Matsuo <tmatsuo@google.com>
Source-Date: Thu Jul 30 18:26:35 2020 -0700
Source-Repo: googleapis/synthtool
Source-Sha: 39b527a39f5cd56d4882b3874fc08eed4756cebe
Source-Link: googleapis/synthtool@39b527a

Co-authored-by: Tres Seaver <tseaver@palladion.com>

Since c05b8b5 oauth2.id_token.verify_oauth2_token handles the issuer
check itself, so remove this redundant check from the docs.

…633)

This works for App Engine, Cloud Run and Flex. On Compute Engine you
can request custom scopes, but they are ignored.

Co-authored-by: Tres Seaver <tseaver@palladion.com>
Co-authored-by: Bu Sun Kim <8822365+busunkim96@users.noreply.github.com>

This reverts commit 05f9524.

The compatibility bug was fixed in the aioresponses package version 0.7.1 - https://pypi.org/project/aioresponses/

Fixes #632

🤖 I have created a release \*beep\* \*boop\* 
---
## [1.23.0](https://www.github.com/googleapis/google-auth-library-python/compare/v1.22.1...v1.23.0) (2020-10-29)


### Features

* Add custom scopes for access tokens from the metadata service ([#633](https://www.github.com/googleapis/google-auth-library-python/issues/633)) ([0323cf3](https://www.github.com/googleapis/google-auth-library-python/commit/0323cf390b16e8483660ac88775e8ea4e7f7702d))


### Bug Fixes

* **deps:** Revert "fix: pin 'aoihttp < 3.7.0dev' ([#634](https://www.github.com/googleapis/google-auth-library-python/issues/634))" ([#632](https://www.github.com/googleapis/google-auth-library-python/issues/632)) ([#640](https://www.github.com/googleapis/google-auth-library-python/issues/640)) ([b790e65](https://www.github.com/googleapis/google-auth-library-python/commit/b790e6535cc37591b23866027a426cde312e07c1))
* pin 'aoihttp < 3.7.0dev' ([#634](https://www.github.com/googleapis/google-auth-library-python/issues/634)) ([05f9524](https://www.github.com/googleapis/google-auth-library-python/commit/05f95246fab928fe2f445781117eeac8088497fb))
* remove checks for ancient versions of Cryptography ([#596](https://www.github.com/googleapis/google-auth-library-python/issues/596)) ([6407258](https://www.github.com/googleapis/google-auth-library-python/commit/6407258956ec42e3b722418cb7f366e5ae9272ec)), closes [/github.com//issues/595#issuecomment-683903062](https://www.github.com/googleapis//github.com/googleapis/google-auth-library-python/issues/595/issues/issuecomment-683903062)
---


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