remove --break-system-packages flags

Author: Pieter van Beerendonk

docker/backend/Dockerfile

@@ -10,7 +10,7 @@ RUN mkdir code
 WORKDIR /code
 COPY requirements.txt ./
 
-RUN pip3 install -Ur requirements.txt --break-system-packages
+RUN pip3 install -Ur requirements.txt
 
 # run app
 EXPOSE 5000

docker/tester/Dockerfile

@@ -19,8 +19,8 @@ WORKDIR /code
 
 COPY requirements.txt /requirements.txt
 COPY tests/requirements.txt /requirements.tests.txt
-RUN pip3 -q install -Ur /requirements.txt --break-system-packages
-RUN pip3 -q install -Ur /requirements.tests.txt --break-system-packages
+RUN pip3 -q install -Ur /requirements.txt
+RUN pip3 -q install -Ur /requirements.tests.txt
 
 # run app
 ENTRYPOINT ["pytest"]