Update nginx Docker tag to v1.25

This MR contains the following updates:

Package	Update	Change
nginx	minor	1.19 -> 1.25

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verwaltung/docker_jameica/templates/docker-compose.yml

@@ -36,7 +36,7 @@ services:
 
 
   nginx:
-    image: nginx:1.19
+    image: nginx:1.25
     restart: always
     depends_on:
       - vnc