fix(python): use system python-pipx to honor PEP 668

[palazzem]

Bug

Failing job: https://github.com/palazzem/hanzo/actions/runs/5262470093/jobs/9523058544

TASK [development : Installing Python isolated environments (pipx)] ************
fatal: [localhost]: FAILED! => {"changed": false, "cmd": ["/usr/bin/python3", "-m", "pip.__main__", "install", "-U", "--user", "pipx"], "msg": "\n:stderr: error: externally-managed-environment\n\n× This environment is externally managed\n╰─> To install Python packages system-wide, try 'pacman -S\n    python-xyz', where xyz is the package you are trying to\n    install.\n    \n    If you wish to install a non-Arch-packaged Python package,\n    create a virtual environment using 'python -m venv path/to/venv'.\n    Then use path/to/venv/bin/python and path/to/venv/bin/pip.\n    \n    If you wish to install a non-Arch packaged Python application,\n    it may be easiest to use 'pipx install xyz', which will manage a\n    virtual environment for you. Make sure you have python-pipx\n    installed via pacman.\n\nnote: If you believe this is a mistake, please contact your Python installation or OS distribution provider. You can override this, at the risk of breaking your Python installation or OS, by passing --break-system-packages.\nhint: See PEP 668 for the detailed specification.\n"}

Overview

This error is due to the fact Archlinux honors PEP668 and now installing Python packages using python3 -m pip install x.y.z is not working anymore.

This change uses python-pipx as suggested by ArchLinux itself.