fix: upgrade PyTorch to 2.4.0+ for H200/SM_90 GPU support

HuggingFace is migrating ZeroGPU from A100 to H200 hardware.
H200 uses SM_90 CUDA architecture which requires PyTorch 2.4.0+.
This fixes silent build failures on A100 Spaces.

Co-Authored-By: Claude <[email protected]>

requirements.txt

@@ -2,7 +2,7 @@
 gradio==4.44.0
 
 # Core ML/Data
-torch>=2.0.0
+torch>=2.4.0
 transformers>=4.35.0
 chronos-forecasting>=1.2.0
 datasets>=2.14.0
@@ -19,4 +19,4 @@ altair>=5.0.0
 python-dotenv
 tqdm
 
-# Cache bust: v1.5.0 - Gradio 5.x upgrade + 1,800h context
+# Cache bust: v1.6.0 - PyTorch 2.4+ for H200/SM_90 + 1125h context