missing pyproject.toml triggers a deprecation warning from pip

Bug #1996050 reported by Roberto Arista
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lxml
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Bug Description

trying to install lxml-4.9.1 on python3.11 with pip 22.3 triggers the following warning:

DEPRECATION: lxml is being installed using the legacy 'setup.py install' method, because it does not have a 'pyproject.toml' and the 'wheel' package is not installed. pip 23.1 will enforce this behaviour change. A possible replacement is to enable the '--use-pep517' option. Discussion can be found at https://github.com/pypa/pip/issues/8559

the warning points to this issue: https://github.com/pypa/pip/issues/8559

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