[3.13] gh-145376: Fix various reference leaks (GH-145377) (#148661)

(cherry picked from commit bd13cc09fa)

Co-authored-by: Jelle Zijlstra <jelle.zijlstra@gmail.com>

Python/pythonrun.c

@@ -1150,6 +1150,7 @@ _PyErr_Display(PyObject *file, PyObject *unused, PyObject *value, PyObject *tb)
 
     if (print_exception_fn == NULL || !PyCallable_Check(print_exception_fn)) {
         Py_DECREF(traceback_module);
+        Py_XDECREF(print_exception_fn);
         goto fallback;
     }