patch 9.1.1189: if_python: build error due to incompatible pointer types

Problem:  if_python: build error due to incompatible pointer types
Solution: cast pointer to PyObject* (oreo639)

Avoid build failure due to -Wincompatible-pointer-types becoming an error in
gcc 14.
When Py_LIMITED_API is < 0x030b0000, then the for Py_XDECREF must be PyObject*.
Vim targets Py_LIMITED_API = 0x03080000 (python 3.8).

closes: #16824

Signed-off-by: oreo639 <oreo6391@gmail.com>
Signed-off-by: Christian Brabandt <cb@256bit.org>
diff --git a/src/if_py_both.h b/src/if_py_both.h
index 5603ac7..a679be5 100644
--- a/src/if_py_both.h
+++ b/src/if_py_both.h
@@ -5397,7 +5397,7 @@
 {
     RangeObject *self = (RangeObject*)self_obj;
     PyObject_GC_UnTrack((void *)(self));
-    Py_XDECREF(self->buf);
+    Py_XDECREF(((PyObject *)(self->buf)));
     PyObject_GC_Del((void *)(self));
 }