Bump django-countries from 5.5 to 6.1.2 in /backend

[dependabot-preview[bot]]

Bumps django-countries from 5.5 to 6.1.2.

Changelog

Sourced from django-countries's changelog.

6.1.2 (26 March 2020)

• Fix Python 3.5 syntax error (no f-strings just yet...).

6.1.1 (26 March 2020)

• Change ISO country import so that "Falkland Islands [Malvinas]" => "Falkland Islands (Malvinas)".

6.1 (20 March 2020)

• Add a GraphQL object type for a django Country object.

6.0 (28 February 2020)

• Make DRF CountryField respect blank=False. This is a backwards incompatible change since blank input will now return a validation error (unless blank is explicitly set to True).
• Fix COUNTRIES_OVERRIDE when using the complex dictionary format and a single name.
• Add bandit to the test suite for basic security analysis.
• Drop Python 2.7 and Python 3.4 support.
• Add Rest Framework 3.10 and 3.11 to the test matrix, remove 3.8.
• Fix a memory leak when using PyUCA. Thanks Meiyer (aka interDist)!

Commits

• 6ff758d Preparing release 6.1.2
• fdfd658 Fix Python 3.5 compatibility
• d9323ef Back to development: 6.2
• d1b908b Preparing release 6.1.1
• 00a2781 Note Falkland Islands fix in change log
• 4a4aefc Fix #299 - Falkland Islands naming
• 5a0ac47 Ensure wheels will get built by zest for future releases
• ee7a360 Back to development: 6.2
• 488ccaf Preparing release 6.1
• 7583382 Update manifest to include graphql dir
• Additional commits viewable in compare view

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[dependabot-preview[bot]]

Looks like django-countries is up-to-date now, so this is no longer needed.