fix(docker): upgrade pip on build

api/Dockerfile

@@ -12,6 +12,7 @@ RUN mkdir /usr/src/app
 WORKDIR /usr/src/app
 
 COPY requirements.txt /usr/src/app/
+RUN pip install --no-cache-dir --upgrade pip
 RUN pip install --no-cache-dir -r requirements.txt
 
 COPY . /usr/src/app