pip reports legacy setup.py bdist wheel mechanism is deprecated

[felixp98]

pip 25.1.1 is reporting the following deprecation warning for this package:

DEPRECATION: Building 'json2html' using the legacy setup.py bdist_wheel mechanism, which will be removed in a future version. pip 25.3 will enforce this behaviour change. A possible replacement is to use the standardized build interface by setting the --use-pep517 option, (possibly combined with --no-build-isolation), or adding a pyproject.toml file to the source tree of 'json2html'. Discussion can be found at pypa/pip#6334