chore(deps): update dependency django-countries to v7.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-countries (changelog)	==7.5.1 -> ==7.6

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Release Notes

SmileyChris/django-countries (django-countries)

### [`v7.6`](https://togithub.com/SmileyChris/django-countries/blob/HEAD/CHANGES.rst#76-27-March-2024) [Compare Source](https://togithub.com/SmileyChris/django-countries/compare/v7.5.1...v7.6) \=================== - Replace deprecated `pkg_resources.iter_entry_points` with `importlib_metadata`. - Support Django 5.0.

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