Update XLA pin (#121501)
To https://github.com/pytorch/xla/commit/8078b8f38cadea97d8fee0b88e53ee2c24b35078
Fixes regression caused by https://github.com/pytorch/pytorch/pull/120076
Pull Request resolved: https://github.com/pytorch/pytorch/pull/121501
Approved by: https://github.com/Skylion007, https://github.com/aakhundov, https://github.com/albanD
