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_gitea/templates/docker-compose.yml

@@ -4,7 +4,7 @@ version: "2.4"
 services:
 
   app:
-    image: gitea/gitea:1.17.3
+    image: gitea/gitea:1.19.0
     restart: always
     depends_on:
       - db