setup: support only python3.12

setup.cfg

@@ -1,6 +1,6 @@
 # -*- coding: utf-8 -*-
 #
-# Copyright (C) 2023 Graz University of Technology.
+# Copyright (C) 2023-2024 Graz University of Technology.
 #
 # invenio-global-search is free software; you can redistribute it and/or modify
 # it under the terms of the MIT License; see LICENSE file for more details.
@@ -17,8 +17,7 @@ author_email =
 platforms = any
 url = https://github.com/tu-graz-library/invenio-global-search
 classifiers =
-    Programming Language :: Python :: 3.9
-    Programming Language :: Python :: 3.10
+    Programming Language :: Python :: 3.12
     Development Status :: 5 - Production/Stable
     License :: OSI Approved :: MIT License
     Operating System :: OS Independent