Revert "Moves supported python runtimes from version 3.8 to 3.10"HEADmaster

This reverts commit d6cdf97c4559cfde324289d191460470ee96ef02.

Keeping Python 3.10 in setup.cfg classifier and zuul.yaml changes.

Reason for revert:

Needed-By: https://review.opendev.org/c/openstack/openstack-zuul-jobs/+/882175

TC has been discussing about re-adding the python 3.8
testing in current master 2023.2 release testing.

- https://meetings.opendev.org/meetings/tc/2023/tc.2023-04-25-18.00.log.html#l-191
- https://lists.openstack.org/pipermail/openstack-discuss/2023-April/033469.html

While governance changes are under review, TC agreed to add py3.8 testing
so that we do not see more project/lib dropping python 3.8 and make them
uninstalable on python 3.8

- https://meetings.opendev.org/meetings/tc/2023/tc.2023-05-02-18.00.log.html#l-17
- https://review.opendev.org/c/openstack/governance/+/882165

Also adding py3.8 testing back in job https://review.opendev.org/c/openstack/openstack-zuul-jobs/+/882175

Change-Id: I77db3800c22bb8f04a33e6c79f2da8947f30d484

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