Update PyTorch Version in OpenVINO

End-to-end procedure for bumping the PyTorch version used by OpenVINO layer tests and the PyTorch frontend, and fixing the regressions that typically follow.

Step 0: Confirm Scope

Before editing anything, confirm with the user:

• Target versions for torch, torchvision:
  • torchvision minor = torch minor + 15 — e.g. torch 2.9.0 ↔ torchvision 0.24.0, torch 2.12.0 ↔ torchvision 0.27.0. Always confirm against the official release matrix.
  • torchaudio is not pinned by tests/requirements_pytorch: it is unused by these tests and PyTorch removed it from the official installation instructions starting with the 2.8 release. Do not re-add it. If a future task genuinely needs torchaudio, note that it is in a maintenance phase and its latest release can lag torch by one or more minors (e.g. torch 2.12.0 ↔ torchaudio 2.11.0), so torchaudio==<torch version> may not exist — look up the latest available wheel at https://download.pytorch.org/whl/cpu/torchaudio/. Recent torchaudio wheels carry no Requires-Dist: torch pin, so a slightly older torchaudio installs cleanly alongside a newer torch.
• Whether tests/model_hub_tests/pytorch/envs/compile_gptq.txt (pinned at torch==2.3.1, torchaudio==2.3.1 for auto-gptq) should be touched. Default: leave it alone.
• Both the default TorchScript path and PYTORCH_TRACING_MODE=EXPORT (FX) path must be validated. Skip the FX run only if the user explicitly opts out.

Step 1: Update Version Pins

Edit the following files. Keep ~= style in constraints.txt, exact == in requirements_*. A.B is the torchvision version (torch minor + 15):