Upgrade to Nginx 1.26.3 (#580)

Author: giohappy

.env.sample

@@ -8,7 +8,7 @@ DOCKER_API_VERSION="1.24"
 BACKUPS_VOLUME_DRIVER=local
 
 GEONODE_BASE_IMAGE_VERSION=master
-NGINX_BASE_IMAGE_VERSION=1.25.3-latest
+NGINX_BASE_IMAGE_VERSION=1.26.3-latest
 LETSENCRYPT_BASE_IMAGE_VERSION=2.6.0-latest
 GEOSERVER_BASE_IMAGE_VERSION=2.24.4-latest
 GEOSERVER_DATA_BASE_IMAGE_VERSION=2.24.4-latest