Fix PyTorch version specification in requirements files

- Remove invalid local version labels from torch requirements
- Use proper pip syntax: torch>=2.0.0 with --index-url for CUDA/ROCm
- Fix pip installation errors for CUDA and ROCm builds

requirements-cuda.txt

 Flask>=2.0.0
-torch>=2.0.0+cu118 --index-url https://download.pytorch.org/whl/cu118
+torch>=2.0.0 --index-url https://download.pytorch.org/whl/cu118
 transformers>=4.30.0
 opencv-python>=4.5.0
 psutil>=5.8.0

requirements-rocm.txt

 Flask>=2.0.0
-torch>=2.0.0+rocm5.6 --index-url https://download.pytorch.org/whl/rocm5.6
+torch>=2.0.0 --index-url https://download.pytorch.org/whl/rocm5.6
 transformers>=4.30.0
 opencv-python>=4.5.0
 psutil>=5.8.0