[3.9] gh-87604: Avoid publishing list of active per-interpreter audit hooks via the gc module (GH-99373) (GH-99493)

Python/sysmodule.c

@@ -440,6 +440,8 @@ sys_addaudithook_impl(PyObject *module, PyObject *hook)
         if (is->audit_hooks == NULL) {
             return NULL;
         }
+        /* Avoid having our list of hooks show up in the GC module */
+        PyObject_GC_UnTrack(is->audit_hooks);
     }
 
     if (PyList_Append(is->audit_hooks, hook) < 0) {