minor fix on typing

src/secmlt/adv/evasion/modular_attack.py

@@ -133,7 +133,7 @@ def _run(
         labels: torch.Tensor,
         init_deltas: torch.Tensor = None,
         **optim_kwargs,
-    ) -> [torch.Tensor, torch.Tensor]:
+    ) -> tuple[torch.Tensor, torch.Tensor]:
         multiplier = 1 if self.y_target is not None else -1
         target = (
             torch.zeros_like(labels) + self.y_target