Bump idna from 3.8 to 3.9

Bumps idna from 3.8 to 3.9.

Changelog

Sourced from idna's changelog.

3.9 (2024-09-13) ++++++++++++++++

• Update to Unicode 16.0.0
• Deprecate setup.cfg in favour of pyproject.toml
• Use ruff for code formatting

Thanks to Waket Zheng for contributions to this release.

Commits

• 1b8800a Release v3.9
• a1fd168 Merge pull request #190 from kjd/unicode-16
• 7732c61 Merge branch 'master' into unicode-16
• 4ed183d Refactor membership test
• 762216b Format with ruff
• 580ece9 Implement changes to UTS46 algorithm
• 5343dd5 Update IDNA data to Unicode 16.0.0
• d5b7696 Merge pull request #189 from kjd/fix-sigstore-action
• 336fe1a Upgrade gh-action-sigstore-python to v3.0.0
• 3a26791 Merge pull request #186 from kjd/format-code
• Additional commits viewable in compare view