hghave: add py312 and py313

While not required in the core test suite in the moment, these could be useful
in the future or for extensions. For example, Python 3.12 removed distutils and
it might make sense to differentiate based on that.

tests/hghave.py

@@ -868,7 +868,11 b' def has_demandimport():'
 
 # Add "py36", "py37", ... as possible feature checks. Note that there's no
 # punctuation here.
-@checkvers("py", "Python >= %s", ('3.6', '3.7', '3.8', '3.9', '3.10', '3.11'))
+@checkvers(
+    "py",
+    "Python >= %s",
+    ('3.6', '3.7', '3.8', '3.9', '3.10', '3.11', '3.12', '3.13'),
+)
 def has_python_range(v):
     major, minor = v.split('.')[0:2]
     py_major, py_minor = sys.version_info.major, sys.version_info.minor