Bump countries from 5.5.0 to 5.6.0 (#81)

Bumps [countries](https://github.com/countries/countries) from 5.5.0 to 5.6.0.
- [Release notes](https://github.com/countries/countries/releases)
- [Changelog](https://github.com/countries/countries/blob/master/CHANGELOG.md)
- [Commits](countries/countries@v5.5.0...v.5.6.0)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

Gemfile.lock

@@ -109,7 +109,7 @@ GEM
       xpath (~> 3.2)
     concurrent-ruby (1.2.2)
     connection_pool (2.4.1)
-    countries (5.5.0)
+    countries (5.6.0)
       unaccent (~> 0.3)
     crass (1.0.6)
     date (3.3.3)