Restrict to torch < 2.5.0 and change channel (iree-org#229)

The CPU requirements restrict torch to a version < 2.5.0, whereas the
ROCm requirements did not so far. The current iree-turbine is
incompatible with torch 2.5.0 as `torch.export.dynamic_dim()` was
removed with pytorch/pytorch@b454c51. Version 2.4 releases for ROCm 6.0
are available via a different channel, changing that accordingly.

pytorch-rocm-requirements.txt

@@ -1,5 +1,5 @@
 --pre
---index-url https://download.pytorch.org/whl/nightly/rocm6.0
-torch>=2.3.0
+--index-url https://download.pytorch.org/whl/rocm6.0
+torch>=2.3.0, <2.5.0
 torchaudio
 torchvision