Upgrade torch version

Upgrade torch version to fix the following error:

```
ERROR: Could not find a version that satisfies the requirement torch==1.10.2 (from versions: 1.11.0, 1.12.0, 1.12.1, 1.13.0, 1.13.1, 2.0.0, 2.0.1, 2.1.0)
ERROR: No matching distribution found for torch==1.10.2
```

requirements.txt

@@ -1,6 +1,6 @@
 nltk==3.7
 transformers==4.13.0
-torch==1.10.2
+torch==1.13.1
 librosa==0.9.1
 numpy==1.21
 gradio==2.8.13