CI: Add testing against Python 3.13

Python 3.13 is shipping in Fedora Linux for Fedora Linux 41, so we
should ensure kiwi is tested against it. The testing setup is
based on the latest development version of 3.13 as it is not
yet released.

.github/workflows/ci-code-style.yml

@@ -9,10 +9,10 @@ on:
 jobs:
   unit_tests:
     name: Linter checks for KIWI python and Shell code
-    runs-on: ubuntu-20.04
+    runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v3

.github/workflows/ci-units-types.yml

@@ -12,7 +12,7 @@ jobs:
     runs-on: ubuntu-latest
     strategy:
       matrix:
-        python-version: ["3.9", "3.10", "3.11", "3.12"]
+        python-version: ["3.9", "3.10", "3.11", "3.12", "3.13"]
 
     steps:
       - uses: actions/checkout@v3

tox.ini

@@ -17,6 +17,7 @@ skip_missing_interpreters = True
 skipsdist = True
 envlist =
     check,
+    unit_py3_13,
     unit_py3_12,
     unit_py3_11,
     unit_py3_10,
@@ -26,7 +27,7 @@ envlist =
 
 [testenv]
 description =
-    {unit_py3_9,unit_py3_10,unit_py3_11,unit_py3_12}: Unit Test run with basepython set to {basepython}
+    {unit_py3_9,unit_py3_10,unit_py3_11,unit_py3_12,unit_py3_13}: Unit Test run with basepython set to {basepython}
     devel: Test KIWI
 allowlist_externals =
     bash
@@ -41,6 +42,7 @@ allowlist_externals =
     python
     pytest
 basepython =
+    unit_py3_13: python3.13
     unit_py3_12: python3.12
     unit_py3_11: python3.11
     unit_py3_10: python3.10
@@ -96,6 +98,15 @@ commands =
     {[testenv:mypy]commands}
     {[testenv:unit]commands}
 
+# Test run with basepython set to 3.13
+[testenv:unit_py3_13]
+setenv =
+    PYTHONPATH={toxinidir}/test
+changedir=test/unit
+commands =
+    {[testenv:mypy]commands}
+    {[testenv:unit]commands}
+
 
 [testenv:mypy]
 description = Static Type Checking Base