Bump minimum Python version to 3.12

We require ansible>=11 which needs Python >=3.11. Since all our
supported distributions have Python 3.12 as default, make this the
minimum.

Change-Id: I8699acef0e88618f86fe854be170d885fc1ab8c8
Signed-off-by: Pierre Riteau <pierre@stackhpc.com>

Author: priteau

releasenotes/notes/drop-python310-and-311-b284d9a4d8d91324.yaml

@@ -0,0 +1,5 @@
+---
+upgrade:
+  - |
+    Python 3.10 and 3.11 are no longer supported on the control host. Use
+    Python 3.12 as a minimum version for the Kayobe virtualenv.

setup.cfg

@@ -6,7 +6,7 @@ description_file =
 author = OpenStack
 author_email = openstack-discuss@lists.openstack.org
 home_page = https://docs.openstack.org/kayobe/latest/
-python_requires = >=3.10
+python_requires = >=3.12
 license = Apache License, Version 2.0
 classifier =
     Environment :: OpenStack
@@ -18,8 +18,6 @@ classifier =
     Programming Language :: Python :: Implementation :: CPython
     Programming Language :: Python :: 3 :: Only
     Programming Language :: Python :: 3
-    Programming Language :: Python :: 3.10
-    Programming Language :: Python :: 3.11
     Programming Language :: Python :: 3.12
 
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