Linting: Avoid extraneous parentheses

Signed-off-by: Christoph Berganski <[email protected]>

Author: iksnagreb

src/onnx_ir/_core.py

@@ -839,7 +839,7 @@ def shape(self) -> Shape:
     @property
     def size(self) -> int:
         """The number of elements in the tensor."""
-        return sum((len(string) for string in self.string_data()))
+        return sum(len(string) for string in self.string_data())
 
     @property
     def nbytes(self) -> int: