Change the delimiter

Signed-off-by: DarkLight1337 <[email protected]>

vllm/multimodal/processing.py

@@ -621,7 +621,7 @@ def _iter_bytes_to_hash(self, key: str, obj: object) -> Iterable[bytes]:
             return
         if isinstance(obj, dict):
             for k, v in obj.items():
-                yield from self._iter_bytes_to_hash(f"{key}_{k}", v)
+                yield from self._iter_bytes_to_hash(f"{key}.{k}", v)
             return
 
         # Simple cases