ENH: Update pyBase.i runtime Python version check from 3.9 to 3.10

The runtime version guard in pyBase.i checked for Python 3.9 but
CMake/ITKSetPython3Vars.cmake already sets PYTHON_VERSION_MIN=3.10,
and the codebase now uses Python 3.10-only syntax (PEP 604 unions).

A Python 3.9 user would pass the old guard but immediately hit a
TypeError at import time from the X|Y type annotations.

Update the check and error message to match the CMake minimum,
as the comment in pyBase.i instructs.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

Author: hjmjohnson

Wrapping/Generators/Python/PyBase/pyBase.i

@@ -12,8 +12,8 @@ import collections
 from sys import version_info as _version_info
 # Set values below to the same value as
 # PYTHON_VERSION_MIN in ITKSetPython3Vars.cmake
-if _version_info < (3, 9, 0):
-    raise RuntimeError("Python 3.9 or later required")
+if _version_info < (3, 10, 0):
+    raise RuntimeError("Python 3.10 or later required")
 
 from . import _ITKCommonPython
 %}