Revert "Version bump to 0.14.0.dev0 (#1675)" (#1676)

This reverts commit 5727392.

Author: grasskin

keras_nlp/src/version_utils.py

@@ -15,7 +15,7 @@
 from keras_nlp.src.api_export import keras_nlp_export
 
 # Unique source of truth for the version number.
-__version__ = "0.14.0.dev0"
+__version__ = "0.13.0"
 
 
 @keras_nlp_export("keras_nlp.version")