Support python 3.12 (and 3.13, and future versions)

[awoimbee]

According to the pyproject:

# We need to support at least 3.8 because of pandas and limit to 3.11 because of
# numpy.
python = "^3.8, <3.12"

Numpy is now compatible with python 3.12.

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Note that specifying an upper limit for the python version is discouraged, the official docs say:

Think twice before applying an upper bound like requires-python = "<= 3.10" here. This blog post contains some information regarding possible problems.

[codie3611]

I tried to bump it up recently but some dependency didn't work with 12 yet. But yes I agree we can simply remove the upper limit.