Takashi Kajinami 467e7ecc18 Remove Python 3.8 support
Python 3.8 was removed from the tested runtimes for 2024.2[1] and has
not been tested since then.

Also add Python 3.12 which is part of the tested runtimes for 2025.1.
Now unit tests job with Python 3.12 is voting.

[1] https://governance.openstack.org/tc/reference/runtimes/2024.2.html

Change-Id: Ifc461fd0eccde637f55c24610f1f81d51cab1689
2024-10-24 18:29:37 +09:00
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