[google-genai] Test instrumentation on google-genai v1.64.0 (#4253)

* [google-genai] Test instrumentation on google-genai v1.63.0

* Add package version upper bound

* bump latest version for python 3.9

* fix README

* bump google-auth version for python 3.9

* add package upper limit to pyproject.toml

* [google-genai] Test instrumentation on google-genai v1.64.0

* fix upper case method in cassette not matching lower case one generated by aiohttp

* fix async calls hanging in vcrpy

* Remove package upper limit

* fix import error in python 3.9

* fix google-genai module lower bound

* Add link to vcr issue

* Add comment about request method

* Fix lint errors

* Fix spellcheck

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Co-authored-by: Aaron Abbott <aaronabbott@google.com>