build(deps): bump django-countries from 8.2.0 to 9.0.0

[dependabot]

Bumps django-countries from 8.2.0 to 9.0.0.

Changelog

Sourced from django-countries's changelog.

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)

Commits

• 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
• 229fd80 Clarify docs: multiple=True returns MultipleCountriesDescriptor, not list
• b4eb7f5 Exclude .mypy_cache from source distributions
• efae6fc Return None for nullable CountryField when value is NULL
• 88c36c9 Add locale-sorted countries helper
• 01e62f7 Add Django 6.0, Python 3.14, drop unsupported versions
• b0877b5 Add regression test for issue #300: COUNTRIES_ONLY and migrations
• Additional commits viewable in compare view

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[jelly]

@dependabot rebase