Support for Python 3.11 / 3.12

[bverhoeve]

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Is your feature request related to a problem? Please describe.
There is mentioned support for Python as of 3.5 on pypi. In the nox tests, I've found support for Python 3.10. Considering that 3.11 and 3.12 have been available for some time and are available for most PaaS services in Google Cloud, I was wondering what the next steps are for Python 3.12 support.

Describe the solution you'd like
Provide support for Python 3.11, 3.12.

Describe alternatives you've considered
Running the library in 3.12 without waiting for official support.

Additional context