Update deprecated type hinting in models (#18132)

Signed-off-by: Harry Mellor <19981378+hmellor@users.noreply.github.com>

vllm/model_executor/models/smolvlm.py

@@ -1,6 +1,6 @@
 # SPDX-License-Identifier: Apache-2.0
 
-from typing import Dict, Optional
+from typing import Optional
 
 from transformers import SmolVLMProcessor
 
@@ -21,7 +21,7 @@ class SmolVLMProcessingInfo(Idefics3ProcessingInfo):
     def get_hf_processor(
         self,
         *,
-        max_image_size: Optional[Dict[str, int]] = None,
+        max_image_size: Optional[dict[str, int]] = None,
         **kwargs: object,
     ) -> SmolVLMProcessor:
         if max_image_size is not None: