Infinity support: Short max_length for more optimized deployment

@ Alibaba Team, thanks so much for the support of this model.

How to run with https://github.com/michaelfeil/infinity
```
infinity_emb v2 --model-id Alibaba-NLP/gte-Qwen2-1.5B-instruct --revision "refs/pr/{thisnum}" --batch-size 4 --device cuda --engine torch
```

tokenizer_config.json

@@ -39,7 +39,7 @@
   "clean_up_tokenization_spaces": false,
   "eos_token": "<|endoftext|>",
   "errors": "replace",
-  "model_max_length": 32768,
+  "model_max_length": 2048,
   "pad_token": "<|endoftext|>",
   "split_special_tokens": false,
   "tokenizer_class": "Qwen2Tokenizer",