Add 'canonical' to global strings tables

The _Py_ID(canonical) identifier used by the clinic-generated
argument parsing code needs to be registered in the global strings.

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

Author: gpshead

Include/internal/pycore_global_objects_fini_generated.h

@@ -359,6 +359,7 @@ struct _Py_global_strings {
         STRUCT_FOR_ID(callable)
         STRUCT_FOR_ID(callback)
         STRUCT_FOR_ID(cancel)
+        STRUCT_FOR_ID(canonical)
         STRUCT_FOR_ID(capath)
         STRUCT_FOR_ID(capitals)
         STRUCT_FOR_ID(category)