Fix python version check

Docstring says Python ≥ 3.12 but code used (3, 15); corrected to match doc and current releases.

modeling_drama.py

@@ -83,7 +83,7 @@ class DramaModelWrapper:
             An instance of the appropriate DramaModel implementation.
         """
         # Check Python version
-        use_nested = sys.version_info >= (3, 15)
+        use_nested = sys.version_info >= (3, 12)
         if not use_nested:
             warnings.warn(
                 "Python version < 3.12 detected. Using non-nested implementation."