convert : fix another python 3.8 issue (#2949)

cebtenzzre · web-flow · commit bce1fef32894 · 2023-08-31T22:13:51.000-04:00
diff --git a/convert.py b/convert.py
@@ -530,7 +530,7 @@ def validate_conversion_to(self, data_type: DataType) -> None:
             raise ValueError(f'Cannot validate conversion from {self.data_type} to {data_type}.')
 
 
-LazyModel = dict[str, LazyTensor]
+LazyModel: TypeAlias = 'dict[str, LazyTensor]'
 
 
 @dataclass
