www/py-google-api-python-client: Update to 2.137.0
- Define DISTNAME because the upstream renamed the distribution file (it is conform to PEP 625 now)
- Use pytest for testing the library
- Ignore a couple of test, because they require Application Default Credentials to pass
Release changes: https://github.com/googleapis/google-api-python-client/releases/tag/v2.137.0
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