Use keras.backend.floatx() instead of keras.config.floatx()

for Keras 2 compatibility

Author: tirthasheshpatel

keras_nlp/models/mistral/mistral_backbone.py

@@ -45,7 +45,7 @@ def __init__(
         **kwargs,
     ):
         # Get the dtype
-        dtype = kwargs.pop("dtype", keras.config.floatx())
+        dtype = kwargs.pop("dtype", keras.backend.floatx())
 
         # Inputs
         token_ids = keras.Input(shape=(None,), dtype="int32", name="token_ids")