BLD: Update base dockerfile to use pyproject.toml

This should have been done when migrating the project requirements
from the old setup to pyproject.

dockerfiles/base/Dockerfile

@@ -39,8 +39,10 @@ WORKDIR ${POREPY_HOME}
 # are useful for achieving good performance.
 RUN pip install pypardiso
 
-# Install dependencies
-RUN pip install -r ./requirements.txt
+# Fetch the dependencies from the pyproject.toml file and install them.
+RUN pip install --no-build-isolation --no-deps -r <(python -c "import toml; print('\n'.join(toml.load('pyproject.toml')['project']['dependencies']))")
+RUN pip install --no-build-isolation --no-deps -r <(python -c "import toml; print('\n'.join(toml.load('pyproject.toml')['project']['optional-dependencies']['development']))")
+
 
 # Move back to code directory
 WORKDIR ${HOME}