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

(cherry picked from commit 4e4b13e8f6)

Co-authored-by: Steve Dower <steve.dower@python.org>

Python/sysmodule.c

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