fix: correct region and subregion retrieval

- Update region access to use country.region instead of city.region
- Update subregion access to use country.subregion instead of city.subregion

These changes ensure that the region and subregion are accurately retrieved based on the correct geographical hierarchy, improving the data integrity of the application.

app/controllers/rss_controller.rb

@@ -31,8 +31,8 @@ class RssController < ApplicationController
             country: format_as_tag(art.city&.country&.name),
             city: format_as_tag(art.city&.name),
             state: format_as_tag(art.city&.state&.name),
-            region: format_as_tag(art.city&.region&.name),
-            subregion: format_as_tag(art.city&.subregion&.name),
+            region: format_as_tag(art.city&.country&.region&.name),
+            subregion: format_as_tag(art.city&.country&.subregion&.name),
             description: art.description,
             prompt: art.prompt,
             date: art.weather_date&.strftime("%Y-%m-%d"),