Bump django-countries from 7.5.1 to 7.6.1 in /requirements

Bumps [django-countries](https://github.com/SmileyChris/django-countries) from 7.5.1 to 7.6.1.
- [Changelog](https://github.com/SmileyChris/django-countries/blob/main/CHANGES.rst)
- [Commits](SmileyChris/django-countries@v7.5.1...v7.6.1)

---
updated-dependencies:
- dependency-name: django-countries
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

requirements/common.txt

@@ -1,6 +1,6 @@
 Babel==2.10.1
 django-contact-form==5.0.1
-django-countries==7.5.1
+django-countries==7.6.1
 django-hosts==5.1
 django-money==3.1
 django-push @ git+https://github.com/brutasse/django-push.git@22fda99641cfbd2f3075a723d92652a8e38220a5