Update idna to 3.4

[pyup-bot]

This PR updates idna from 3.3 to 3.4.

Changelog

3.4

++++++++++++++++

- Update to Unicode 15.0.0
- Migrate to pyproject.toml for build information (PEP 621)
- Correct another instance where generic exception was raised instead of
IDNAError for malformed input
- Source distribution uses zeroized file ownership for improved
reproducibility

Thanks to Seth Michael Larson for contributions to this release.

Links

• PyPI: https://pypi.org/project/idna
• Changelog: https://pyup.io/changelogs/idna/

[pyup-bot]

Closing this in favor of #52