Update deprecated transformer_cache

Dockerfile

@@ -14,7 +14,7 @@ RUN pip install --no-cache-dir -r requirements.txt
 RUN mkdir -p /app/.cache && chmod -R 777 /app/.cache
 
 # Set an environment variable for the cache directory
-ENV TRANSFORMERS_CACHE=/app/.cache
+ENV HF_HOME=/app/.cache
 
 # Expose the port your app will run on
 EXPOSE 7860