Sliding windows: null fix

More info : https://huggingface.co/mistralai/Mixtral-8x7B-Instruct-v0.1/commit/125c431e2ff41a156b9f9076f744d2f35dd6e67a

config.json

@@ -21,7 +21,7 @@
   "rms_norm_eps": 1e-05,
   "rope_theta": 1000000.0,
   "router_aux_loss_coef": 0.02,
-  "sliding_window": 4096,
+  "sliding_window": null,
   "tie_word_embeddings": false,
   "torch_dtype": "bfloat16",
   "transformers_version": "4.37.0.dev0",