gh-132641: fix race in lru_cache under free-threading (#133787)

Fix race in `lru_cache` by acquiring critical section on the cache object itself and call the lock held variant of dict functions to modify the underlying dict.

Objects/dictobject.c

@@ -2915,6 +2915,11 @@ clear_lock_held(PyObject *op)
     ASSERT_CONSISTENT(mp);
 }
 
+void
+_PyDict_Clear_LockHeld(PyObject *op) {
+    clear_lock_held(op);
+}
+
 void
 PyDict_Clear(PyObject *op)
 {