Remove additional warnning in layer.to (#36700)

* remove additional warnning in layer.to

* remove additional warnning in layer.to

* remove additional warnning in layer.to

* remove additional warnning in layer.to

* remove additional warnning in layer.to

python/paddle/fluid/dygraph/layers.py

@@ -1590,7 +1590,10 @@ class Layer(core.Layer):
 
             return new_t
 
+        with warnings.catch_warnings():
+            warnings.filterwarnings("ignore", category=UserWarning)
             self._apply(transform, device, dtype, blocking)
+
         self._dtype = dtype
 
     # [aliases] Compatible with old method names