App: fixes #10460: App::PropertyPythonObject is not saving data

Since Py3.11 the methods names __setstate__ and __getstate__ conflict with the method names added to the object class.
Thus rename them to 'loads' and 'dumps'

src/Mod/Show/mTempoVis.py

@@ -574,8 +574,8 @@ class TempoVis(object):
 
         return [obj for obj in doc_obj_or_list if is3DObject(obj)]
 
-    def __getstate__(self):
+    def dumps(self):
         return None
 
-    def __setstate__(self, state):
+    def loads(self, state):
         self._init_attrs()