chore(deps): bump i18n-iso-countries from 5.5.0 to 6.0.0

Bumps [i18n-iso-countries](https://github.com/michaelwittig/node-i18n-iso-countries) from 5.5.0 to 6.0.0.
- [Release notes](https://github.com/michaelwittig/node-i18n-iso-countries/releases)
- [Commits](michaelwittig/node-i18n-iso-countries@v5.5.0...v6.0.0)

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

package.json

@@ -65,7 +65,7 @@
     "graphql": "14.6.0",
     "graphql-tag": "2.10.3",
     "helmet": "3.23.0",
-    "i18n-iso-countries": "5.5.0",
+    "i18n-iso-countries": "6.0.0",
     "jsdom": "16.2.2",
     "jsonwebtoken": "8.5.1",
     "load-script": "1.0.0",