try-latest-pytorch does not use the latest pytorch

[pbchekin]

https://github.com/intel/intel-xpu-backend-for-triton/actions/runs/10987962296/job/30503642580#step:2:17

pytorch_ref is not set for "Inductor tests", so instead of the latest commit used the pinned one.

{
  "pytorch_ref": "",
  "suite": "inductor/test_codegen_triton.py inductor/test_triton_extension_backend.py inductor/test_triton_heuristics.py inductor/test_triton_wrapper.py inductor/test_triton_kernels.py",
  "runner_label": "",
  "python_version": "3.9",
  "pytorch_repo": "pytorch/pytorch"
}

[kwasd]

This is not inductor tests workflow problem, this is problem in try-latest-pytorch.yml and also affects other tests.
The commit ID remains empty if get-commit-id got empty branch as input. This is fixed for try-latest-pytorch.yml in #2321

Before fix: https://github.com/intel/intel-xpu-backend-for-triton/actions/runs/10987962296/job/30503634842#step:4:14
After fix: https://github.com/intel/intel-xpu-backend-for-triton/actions/runs/11013947939/job/30583453655#step:4:15

[anmyachev]

@kwasd should we close it?