Add conditional on torch version for scaled_dot_product_attention (#6517)
Changes from #4724 broke support for torch<2.0 in the flops profiler as
the scaled_dot_product_attention [wasn't
added](https://pytorch.org/docs/2.0/generated/torch.nn.functional.scaled_dot_product_attention.html#torch.nn.functional.scaled_dot_product_attention)
until a beta version in torch 2.0
Resolved: #5534
Todo:
- [ ] Test this
- [ ] Issue resolution with users.