Switch to a library which is more well-known.
I also thought the library was the problem for not being able to
template in a JSON path, but that is just a PostgreSQL problem it seems.
- Depend on a python version Debian actually ships with in
pyproject.toml and update the poetry.lock accordingly.
- Fix poetry bundle complaining about no python by installing
python-is-python3.
Also remove the python flag for poetry bundle then.
