Use python 3.13 for mypy tests

The tests are currently failing as mypy is using python 3.8 and the
latest pytest 9.0.0 is using features from python 3.10+. This will fix
the issue.

Signed-off-by: Michal Konecny <mkonecny@redhat.com>

Author: Zlopez

mypy.cfg

@@ -1,7 +1,7 @@
 # Global options:
 
 [mypy]
-python_version = 3.8
+python_version = 3.13
 warn_return_any = True
 warn_unused_configs = True
 ignore_missing_imports = True