Update config.json

Update version to 4.40.0. Hopefully should not cause problems.

config.json

@@ -21,7 +21,7 @@
   "rope_theta": 10000.0,
   "tie_word_embeddings": true,
   "torch_dtype": "float32",
-  "transformers_version": "4.40.0.dev0",
+  "transformers_version": "4.40.0",
   "use_cache": true,
   "vocab_size": 50304
 }