FIXUP: Update dev env to add python headers for numpy

dev_scripts/env.py

@@ -114,6 +114,7 @@
 RUN apt-get update \
     && apt-get install -y --no-install-recommends dh-python make build-essential \
         git {qt_deps} pipx python3 python3-pip python3-venv dpkg-dev debhelper python3-setuptools \
+        python3-dev \
     && rm -rf /var/lib/apt/lists/*
 # NOTE: `pipx install poetry` fails on Ubuntu Focal, when installed through APT. By
 # installing the latest version, we sidestep this issue.