Fix typing error in test_jac_to_grad.py

Author: ValerianRey

tests/unit/autojac/test_jac_to_grad.py

@@ -191,7 +191,7 @@ def dummy_backward_pre_hook(_module, _grad_output) -> Tensor:
     assert not _has_forward_hook(module)
 
 
-_PARAMETRIZATIONS = [
+_PARAMETRIZATIONS: list[tuple] = [
     (AlignedMTL(), True),
     (DualProj(), True),
     (IMTLG(), True),