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/Objects/capsule.c b/Objects/capsule.c
index a2ff642..800a6c4 100644
--- a/Objects/capsule.c
+++ b/Objects/capsule.c
@@ -260,7 +260,7 @@ capsule_dealloc(PyObject *o)
     if (capsule->destructor) {
         capsule->destructor(o);
     }
-    PyObject_DEL(o);
+    PyObject_Free(o);
 }