Update `transformers_version` to `3.7.6`

Reference: https://github.com/huggingface/transformers.js/releases/tag/3.7.6

app.py

@@ -24,7 +24,7 @@ class Config:
     hf_token: str
     hf_username: str
     is_using_user_token: bool
-    transformers_version: str = "3.7.5"
+    transformers_version: str = "3.7.6"
     hf_base_url: str = "https://huggingface.co"
     transformers_base_url: str = (
         "https://github.com/huggingface/transformers.js/archive/refs"