Correct field type

Author: cjdoris

src/C/consts.jl

@@ -319,7 +319,7 @@ end
     tp_watched::Cchar = 0
 
     # Python 3.13+ fields  
-    tp_versions_used::Cuint = 0
+    tp_versions_used::Cuint16 = 0
 end
 
 const PyTypePtr = Ptr{PyTypeObject}