Fixed reqs file path in Dockerfile

Dockerfile

@@ -33,8 +33,8 @@ RUN apt-get install python3-dev -y
 WORKDIR /code
 
 # install dependencies
-COPY ./requirements.txt /code/requirements.txt
-RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+COPY ./demo/requirements.txt /code/demo/requirements.txt
+RUN pip install --no-cache-dir --upgrade -r /code/demo/requirements.txt
 
 # resolve issue with tf==2.4 and gradio dependency collision issue
 RUN pip install --force-reinstall typing_extensions==4.7.1