No `pyproject.toml`, `pip install` at risk of failing

[leondz]

DEPRECATION: Building 'pyperclip' 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 'pyperclip'. Discussion can be found at pypa/pip#6334