Bump django-countries from 6.1.3 to 7.1

[dependabot-preview]

Bumps django-countries from 6.1.3 to 7.1.

Changelog

Sourced from django-countries's changelog.

7.1 (17 March 2021)

• Allow customising the str_attr of Country objects returned from a CountryField via a new countries_str_attr keyword argument (thanks C. Quentin).
• Add pyuca as an extra dependency, so that it can be installed like pip install django-countries[pyuca].
• Add Django 3.2 support.

7.0 (5 December 2020)

• Add name_only as an option to the Django Rest Framework serializer field (thanks Miguel Marques).
• Add in Python typing.
• Add Python 3.9, Django 3.1, and Django Rest Framework 3.12 support.
• Drop Python 3.5 support.
• Improve IOC code functionality, allowing them to be overridden in COUNTRIES_OVERRIDE using the complex dictionary format.

Commits

• 3be3c63 Preparing release 7.1
• 13140ef Merge pull request #339 from yunojuno/master
• 9bd3428 Update db_collation test
• a65806f Update django version evaluation
• 7ad14d4 Fix up has_db_collation
• ca4c2e9 Update CountryField initialiser
• 3cc6a95 Update subclass use of super
• 72040a0 Merge pull request #337 from adamsol/pyuca-extra-dependency
• 09d23e7 Add pyuca as an extra dependency
• 3d96967 Merge pull request #329 from matthiask/patch-2
• Additional commits viewable in compare view

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[dependabot-preview]

Superseded by #313.