Update Dockerfile

Dockerfile

@@ -1,7 +1,7 @@
 FROM python:3.9
 WORKDIR /code
 COPY ./requirements.txt /code/requirements.txt
-RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+RUN pip install --no-cache-dir -r /code/requirements.txt
 RUN useradd -m -u 1000 user
 USER user
 WORKDIR $HOME/app