refactor(locale): update Polish city name (#3306)

* Update city_name.ts

In accordance with the regulation of the Minister of Internal Affairs and Administration of 29 December 2015, the name of the city "Stargard Szczeciński" is changed to "Stargard".

* Update city_name.ts

---------

Co-authored-by: ST-DDT <ST-DDT@gmx.de>

Author: krpogorzelski

src/locales/pl/location/city_name.ts

@@ -689,7 +689,7 @@ export default [
   'Sośnicowice',
   'Stalowa Wola',
   'Starachowice',
-  'Stargard Szczeciński',
+  'Stargard',
   'Starogard Gdański',
   'Stary Sącz',
   'Staszów',