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

This reverts commit 481936a822.

Keeping Python 3.10 in setup.cfg classifier.

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: I8b17440c9d36b36fe50183e61d6f1c22ece6d3d4

.zuul.yaml

@@ -1,6 +1,6 @@
 - job:
-    name: oslodb-tox-py39-tips
-    parent: openstack-tox-py39
+    name: oslodb-tox-py38-tips
+    parent: openstack-tox-py38
     description: |
       Run unit tests for oslo.db with main branch of important libs.
       Takes advantage of the base tox job's install-siblings feature.
@@ -38,11 +38,11 @@
     name: oslodb-tox-unit-tips
     check:
       jobs:
-        - oslodb-tox-py39-tips
+        - oslodb-tox-py38-tips
         - oslodb-tox-py310-tips
     gate:
       jobs:
-        - oslodb-tox-py39-tips
+        - oslodb-tox-py38-tips
         - oslodb-tox-py310-tips
 
 - project:

setup.cfg

@@ -6,7 +6,7 @@ description_file =
 author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 home_page = https://docs.openstack.org/oslo.db/latest
-python_requires = >=3.9
+python_requires = >=3.8
 classifier =
     Environment :: OpenStack
     Intended Audience :: Information Technology
@@ -15,6 +15,7 @@ classifier =
     Operating System :: POSIX :: Linux
     Programming Language :: Python
     Programming Language :: Python :: 3
+    Programming Language :: Python :: 3.8
     Programming Language :: Python :: 3.9
     Programming Language :: Python :: 3.10
     Programming Language :: Python :: 3 :: Only