chore(deps): bump django-countries from 8.2.0 to 9.1.0 - #3143

Sourced from django-countries's changelog.

9.1.0 (11 September 2026)

Features

• Add Django 6.1 support. Django 4.2 remains supported for now, despite reaching end of life in April 2026; it will be dropped in the next major release. (#494)
• Rename Nauru to Naoero, falling back to the old name's translation until translators catch up. (#496)

9.0.0 (10 June 2026)

Features

• Nullable CountryField (with null=True) now returns None instead of Country(code=None) when the database value is NULL. This makes the nullability explicit at the field level rather than inside the Country object, resulting in cleaner typing where Country.code is always a str (never None).

  Breaking change: Code that previously checked obj.country.code is None should now check obj.country is None. The common pattern if obj.country: continues to work unchanged. (#481)

• Add Django 6.0 and Python 3.14 support. Drop Django 3.2, 5.0, 5.1 and Python 3.8, 3.9. Minimum DRF bumped to 3.14.

• Add an opt-in Countries.sorted(locale=...) helper to return country choices sorted by translated display names.

Bugfixes

• Fix multiple type stub issues in fields.pyi: correct return types for Country.name, Country.alpha3, Country.ioc_code (now str instead of str | None), Country.numeric (now int | None instead of str | None), and MultipleCountriesDescriptor.__iter__ (now Iterator[Country] instead of Any). Also add missing blank_label attribute and accept positional verbose_name argument in CountryField.__init__ overloads. (#483)
• Exclude .mypy_cache directory from source distributions (was 73% of the sdist). (#490)

Improved Documentation

• Clarify that multiple=True returns a MultipleCountriesDescriptor, not a plain list. (#485)

• a6462d3 Preparing release 9.1.0
• 668237c Update translations from Transifex
• 6991134 Update English translation source file
• c433dc1 Add Django 6.1 support
• 1d1b5d0 Fall back to Nauru translation for Naoero
• 8896448 Change Nauru to Naoero
• ee82223 Preparing release 9.0.0
• 4c391e3 Update translations from Transifex
• 08d54b2 Update English translation source file
• 1ada565 Add changelog fragments for 9.0.0
• Additional commits viewable in compare view