Switch back to PyMem_Raw functions for zlib to allocate & free memory

src/zlib_into.c

@@ -20,17 +20,13 @@ PyZlib_Malloc(voidpf ctx, uInt items, uInt size)
         return NULL;
     /* PyMem_Malloc() cannot be used: the GIL is not held when
        inflate() and deflate() are called */
-    /* The builtin zlib module uses PyMem_RawMalloc here, but this was only
-       added to the stable ABI from Python 3.13, so use plain malloc for now */
-    return malloc((size_t)items * (size_t)size);
+    return PyMem_RawMalloc((size_t)items * (size_t)size);
 }
 
 static void
 PyZlib_Free(voidpf ctx, void *ptr)
 {
-    /* The builtin zlib module uses PyMem_RawFree here, but this was only
-       added to the stable ABI from Python 3.13, so use plain free for now */
-    free(ptr);
+    PyMem_RawFree(ptr);
 }
 
 // zlib_error copied from CPython