Update mjaschen/phpgeo requirement from ^5.0 to ^6.0 (#272)

Updates the requirements on [mjaschen/phpgeo](https://github.com/mjaschen/phpgeo) to permit the latest version.
- [Changelog](https://github.com/mjaschen/phpgeo/blob/main/CHANGELOG.md)
- [Commits](mjaschen/phpgeo@5.0.0...6.0.0)

---
updated-dependencies:
- dependency-name: mjaschen/phpgeo
  dependency-type: direct:production
...

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composer.json

@@ -7,7 +7,7 @@
         "jajo/jsondb": "^3.0",
         "kamermans/guzzle-oauth2-subscriber": "^1.0",
         "league/period": "^5.0",
-        "mjaschen/phpgeo": "^5.0",
+        "mjaschen/phpgeo": "^6.0",
         "nette/utils": "^3.2",
         "rinvex/countries": "^9.0",
         "stenope/stenope": "^0.8.0",