hotfix: misaligned pointer cast (#640)

* hotfix: misaligned pointer cast

* Correct field type

* Revert version

* Revert version

* fix type

---------

Co-authored-by: Christopher Rowley <[email protected]>

Author: MilesCranmer

src/C/consts.jl

@@ -315,6 +315,11 @@ end
     finalize::Ptr{Cvoid} = C_NULL
     vectorcall::Ptr{Cvoid} = C_NULL
 
+    # Python 3.12+ fields
+    tp_watched::Cchar = 0
+    
+    # Python 3.13+ fields  
+    tp_versions_used::Cushort = 0
 end
 
 const PyTypePtr = Ptr{PyTypeObject}