Remove myself as maintainer of the Rejseplanen integration (#112426)

* Remove myself as maintainer of the Rejseplanen integration

Unfortunately I don't have the time or energy to maintain the integration.

I have made a post on the Danish HA Facebook group, encouraging someone to take over. https://www.facebook.com/groups/209025039666209/posts/1515990205636346/

* Update CODEOWNERS

CODEOWNERS

@@ -1093,7 +1093,6 @@ build.json @home-assistant/supervisor
 /tests/components/recovery_mode/ @home-assistant/core
 /homeassistant/components/refoss/ @ashionky
 /tests/components/refoss/ @ashionky
-/homeassistant/components/rejseplanen/ @DarkFox
 /homeassistant/components/remote/ @home-assistant/core
 /tests/components/remote/ @home-assistant/core
 /homeassistant/components/renault/ @epenet

homeassistant/components/rejseplanen/manifest.json

@@ -1,7 +1,7 @@
 {
   "domain": "rejseplanen",
   "name": "Rejseplanen",
-  "codeowners": ["@DarkFox"],
+  "codeowners": [],
   "documentation": "https://www.home-assistant.io/integrations/rejseplanen",
   "iot_class": "cloud_polling",
   "loggers": ["rjpl"],