chore(deps): update dependency django-countries to v7.6.1

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
django-countries (changelog)	==7.6 -> ==7.6.1

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Release Notes

SmileyChris/django-countries (django-countries)

### [`v7.6.1`](https://togithub.com/SmileyChris/django-countries/blob/HEAD/CHANGES.rst#761-2-April-2024) [Compare Source](https://togithub.com/SmileyChris/django-countries/compare/v7.6...v7.6.1) \==================== - Fix a TypeError when no country is selected, introduced in the Django 5 fix.

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