ci: use native Ubuntu python for tests

[sergiusens]

• Have you followed the guidelines for contributing?
• Have you signed the CLA?
• Have you successfully run tox run -m lint?
• Have you successfully run tox run -e test-py310? (supported versions: py39, py310, py311, py312)

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Essentially works around this limitation

But additionally ensures:

• we pick dependencies from the Ubuntu base we care about
• use the Python interpreter with whatever patches would have been applied
• the apt dependency is not miss-matched when ubuntu-latest rolls

And as a bonus, the on_push rule now also reacts to being pushed to this here tiobe branch, would make it much easier to test changes to the workflow

[sergiusens]

core-devel/basic is what is broken in spread, network issues, mu suspicion is that the devel pointer has changed