bpo-42519: Replace PyObject_MALLOC() with PyObject_Malloc() (GH-23587)

No longer use deprecated aliases to functions:

* Replace PyObject_MALLOC() with PyObject_Malloc()
* Replace PyObject_REALLOC() with PyObject_Realloc()
* Replace PyObject_FREE() with PyObject_Free()
* Replace PyObject_Del() with PyObject_Free()
* Replace PyObject_DEL() with PyObject_Free()
diff --git a/Modules/_testbuffer.c b/Modules/_testbuffer.c
index d832176..1b4fb09 100644
--- a/Modules/_testbuffer.c
+++ b/Modules/_testbuffer.c
@@ -236,7 +236,7 @@ ndarray_dealloc(NDArrayObject *self)
                 ndbuf_pop(self);
         }
     }
-    PyObject_Del(self);
+    PyObject_Free(self);
 }
 
 static int
@@ -2734,7 +2734,7 @@ staticarray_init(PyObject *self, PyObject *args, PyObject *kwds)
 static void
 staticarray_dealloc(StaticArrayObject *self)
 {
-    PyObject_Del(self);
+    PyObject_Free(self);
 }
 
 /* Return a buffer for a PyBUF_FULL_RO request. Flags are not checked,