cmake(ci): Fix system_deps

cmake/docker/system_deps/python.Dockerfile

@@ -1,7 +1,9 @@
 FROM ortools/cmake:system_deps_swig AS env
 ENV PATH=/root/.local/bin:$PATH
+RUN pacman -Syu --noconfirm pybind11
 RUN pacman -Syu --noconfirm python \
- python-pip python-protobuf python-wheel python-virtualenv
+ python-setuptools python-wheel python-virtualenv \
+ python-pip python-protobuf
 RUN python -m pip install mypy_protobuf
 
 FROM env AS devel