py312-libxml2 @2.13.4 needs an up-to-date installation method

[ballapete (Peter "Pete" Dyballa)]

I get told:

xinstall: mkdir /opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_python_py-libxml2/py312-libxml2/work/destroot/opt/local/share/doc/py312-libxml2
xinstall: mkdir /opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_python_py-libxml2/py312-libxml2/work/destroot/opt/local/share/doc/py312-libxml2/examples
Executing:  cd "/opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_python_py-libxml2/py312-libxml2/work/libxml2-2.13.4/python" && /opt/local/Library/Frameworks/Python.framework/Versions/3.12/bin/python3.12 setup.py --no-user-cfg install --prefix=/opt/local/Library/Frameworks/Python.framework/Versions/3.12 --root=/opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_python_py-libxml2/py312-libxml2/work/destroot 
/opt/local/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/setuptools/_distutils/dist.py:253: UserWarning: 'licence' distribution option is deprecated; use 'license'
  warnings.warn(msg)
running install
/opt/local/Library/Frameworks/Python.framework/Versions/3.12/lib/python3.12/site-packages/setuptools/_distutils/cmd.py:66: SetuptoolsDeprecationWarning: setup.py install is deprecated.
!!

        ********************************************************************************
        Please avoid running ``setup.py`` directly.
        Instead, use pypa/build, pypa/installer or other
        standards-based tools.

        See https://blog.ganssle.io/articles/2021/10/setup-py-deprecated.html for details.
        ********************************************************************************

!!
  self.initialize_options()
running build
running build_py
running build_ext
running install_lib
creating /opt/local/var/macports/build/_opt_local_var_macports_sources_nue.de.rsync.macports.org_macports_release_tarballs_ports_python_py-libxml2/py312-libxml2/work/destroot/opt/local/Library/Frameworks/Python.framework