ignored mypy error

Signed-off-by: Lukas Folle <[email protected]>

Author: lukas-folle-snkeos

monai/transforms/utility/dictionary.py

@@ -1928,7 +1928,7 @@ def __init__(self, keys: KeysCollection, allow_missing_keys: bool = False, **kwa
     def __call__(self, data: Mapping[Hashable, NdarrayOrTensor]) -> dict[Hashable, NdarrayOrTensor]:
         d = dict(data)
         for key in self.key_iterator(d):
-            d[key] = self.flatten_sequence(d[key])
+            d[key] = self.flatten_sequence(d[key])  # type: ignore[assignment]
         return d