update nginx to latest stable version (#489)

Author: IKitKatt

docs/install/reverse-proxies/nginx.md

@@ -184,7 +184,7 @@ Paste the following configuration.
 ```yaml title="docker-compose.yml"
 services:
     remnawave-nginx:
-        image: nginx:1.28
+        image: nginx:1.30
         container_name: remnawave-nginx
         hostname: remnawave-nginx
         volumes:

docs/install/subscription-page/bundled.md

@@ -290,7 +290,7 @@ cd /opt/remnawave/nginx && nano docker-compose.yml
 ```yaml title="docker-compose.yml"
 services:
     remnawave-nginx:
-        image: nginx:1.28
+        image: nginx:1.30
         container_name: remnawave-nginx
         hostname: remnawave-nginx
         volumes: