Drop support for Python 3.8 and 3.9

Change-Id: I214a8d9d543196ea2bd84245921b5584b9864052

releasenotes/notes/drop-python-38-and-39.yaml

@@ -0,0 +1,4 @@
+---
+upgrade:
+  - |
+    Support for Python 3.8 and 3.9 has been dropped.

setup.cfg

@@ -3,23 +3,24 @@ name = mistral
 summary = Mistral Project
 description_file =
     README.rst
-license = Apache License, Version 2.0
+author = OpenStack
+author_email = openstack-discuss@lists.openstack.org
 home_page = https://docs.openstack.org/mistral/latest/
-python_requires = >=3.8
+python_requires = >=3.10
 classifiers =
-    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 :: 3.11
     Environment :: OpenStack
     Intended Audience :: Information Technology
     Intended Audience :: System Administrators
     License :: OSI Approved :: Apache Software License
     Operating System :: POSIX :: Linux
-author = OpenStack
+    Programming Language :: Python
-author_email = openstack-discuss@lists.openstack.org
+    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
+    Programming Language :: Python :: 3.13
 
 [files]
 packages =