Extend support to Python 3.12

[renan-r-santos]

Description

Now that there's a new pytensor release supporting Python 3.12, would it be possible to do the same for pymc?
For reference, here's the last PR where pytensor was bumped: #7020. I'm not sure if the blockers mentioned there still hold.

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[ricardoV94]

Yes we're planning to bump. Some tests are failing so we need to check