py-validate-pyproject: updated to 0.12.2

Version 0.12.2
- ``setuptools`` plugin:
    - Fix problem with ``license-files`` patterns,
      by removing ``default`` value.

Version 0.12.1
- ``setuptools`` plugin:
    - Allow PEP 561 stub names in ``tool.setuptools.package-dir``,

Version 0.12
- ``setuptools`` plugin:
    - Allow PEP 561 stub names in ``tool.setuptools.packages``,

Version 0.11
- Improve error message for invalid replacements in the ``pre_compile`` CLI,
- Allow package to be build from git archive,
- Improve error message for invalid replacements in the ``pre_compile`` CLI,
- Error-out when extra keys are added to ``project.authors/maintainers``,
- De-vendor ``fastjsonschema``,

Version 0.10.1
- Ensure ``LICENSE.txt`` is added to wheel.

Version 0.10
- Add ``NOTICE.txt`` to ``license_files``,
- Use default SSL context when downloading classifiers from PyPI,
- Remove ``setup.py``,
- Explicitly limit oldest supported Python version
- Replace usage of ``cgi.parse_header`` with ``email.message.Message``

(adam)