Update requirements.txt

update requirements.txt because the app generated an error telling that a gpu needs to be used.
This post explains how to solve the issue: https://huggingface.co/docs/hub/en/spaces-gpus

requirements.txt

@@ -7,4 +7,6 @@ pandas==2.2.0
 pypdf==4.0.1
 reportlab==4.1.0
 tiktoken==0.6.0
-transformers==4.37.2
+transformers==4.37.2
+--extra-index-url https://download.pytorch.org/whl/cu118
+torch==2.1.0+cu118