test(matrix): move the test window for python

* with release of python 3.14 we move the test window to the newest four
  versions

* since python3.10 hasn't been supported for the last major releases of
  InvenioRDM it will be ignored for the test matrix

* we keep python3.9 for a while for some backwards compatible bigger
  partners

Author: utnapischtim

.github/workflows/tests-python.yml

@@ -1,6 +1,7 @@
 # -*- coding: utf-8 -*-
 #
 # Copyright (C) 2024 CERN.
+# Copyright (C) 2025 Graz University of Technology.
 
 name: Python CI
 
@@ -11,7 +12,7 @@ on:
         description: "Python versions"
         type: string
         # NOTE: There is no "array" type, so we use "string" and parse it in the matrix
-        default: '["3.9", "3.12"]'
+        default: '["3.9", "3.11", "3.14"]'
       extras:
         description: "Extra dependencies"
         type: string