Update nextcloud Docker tag to v26 - autoclosed

This MR contains the following updates:

Package	Update	Change
nextcloud	major	25.0.5-apache -> 26.0.1-apache

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verwaltung/docker_nextcloud/templates/docker-compose.yml

@@ -27,7 +27,7 @@ services:
 
   app:
 
-    image: nextcloud:25.0.5-apache
+    image: nextcloud:26.0.2-apache
     restart: always
     volumes:
       - /srv/nextcloud/data/:/var/www/html/