Bump django-countries from 5.3.3 to 5.5

Bumps [django-countries](https://github.com/SmileyChris/django-countries) from 5.3.3 to 5.5.
- [Release notes](https://github.com/SmileyChris/django-countries/releases)
- [Changelog](https://github.com/SmileyChris/django-countries/blob/master/CHANGES.rst)
- [Commits](https://github.com/SmileyChris/django-countries/compare/v5.3.3...v5.5

)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

requirements.txt

@@ -19,7 +19,7 @@ dj-database-url==0.5.0
 django-anymail==6.0.1
 django-basic-auth-ip-whitelist==0.2.1
 django-bleach==0.5.3
-django-countries==5.3.3
+django-countries==5.5
 django-extensions==2.1.7
 django-filter==2.1.0
 django-fsm==2.6.1