Changing which python version is "officially" supported

[etiennnr]

What type of PR is this?

/kind documentation
/kind deprecation

What this PR does / why we need it:

Removing Python 3.6, 3.7, 3.8, 3.9 and added 3.12 from setup.py, which will affect the "officially" supported version in the README.

Which issue(s) this PR fixes:

Fixes #2419

Special notes for your reviewer:

Does this PR introduce a user-facing change?

Removing Python 3.6, 3.7, 3.8, 3.9 and added 3.12 from the supported versions list

Additional documentation e.g., KEPs (Kubernetes Enhancement Proposals), usage docs, etc.:

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[roycaihw]

/assign @yliaog

[yliaog]

we are running tests for 3.8, 3.9, 3.10, 3.11 and 3.12, i think you can remove 3.6 and 3.7 from the list

[etiennnr]

Ok I re-addded 3.8 and 3.9. However, Python 3.8 has been out of active/security support for > 1 year and 3.9 just got out of security support about a month ago.

I'd suggest stopping testing / supporting those, but I'm not an active maintainer either so I don't mind that much either 😄

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