Fix typo in type annotations in timm.models.hrnet

[stes]

Minor fix to correct a type annotation from torch.tensor to torch.Tensor.

---

Background:

I noticed this by getting the following error when running torch.jit.script on the model.

RuntimeError: 
Unknown type name 'torch.tensor':
  File "/opt/conda/lib/python3.10/site-packages/timm/models/hrnet.py", line 837
    def forward(self, x) -> List[torch.tensor]:
                                 ~~~~~~~~~~~~ <--- HERE
        out = []
        x = self.conv1(x)

[HuggingFaceDocBuilderDev]

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