increase sha256 chunksize when calculating model hash (#3162)

- Thanks to @AbdBarho, who discovered that increasing the chunksize
dramatically decreases the amount of time to calculate the hash.

Author: lstein

ldm/invoke/model_manager.py

@@ -1156,7 +1156,7 @@ def _has_cuda(self) -> bool:
         return self.device.type == "cuda"
 
     def _diffuser_sha256(
-        self, name_or_path: Union[str, Path], chunksize=4096
+        self, name_or_path: Union[str, Path], chunksize=16777216
     ) -> Union[str, bytes]:
         path = None
         if isinstance(name_or_path, Path):