Updated Nginx Proxy Manager to version 2.9.15.

Author: jlesage

Dockerfile

@@ -12,7 +12,7 @@ ARG DOCKER_IMAGE_VERSION=unknown
 
 # Define software versions.
 ARG OPENRESTY_VERSION=1.19.9.1
-ARG NGINX_PROXY_MANAGER_VERSION=2.9.14
+ARG NGINX_PROXY_MANAGER_VERSION=2.9.15
 ARG NGINX_HTTP_GEOIP2_MODULE_VERSION=3.3
 ARG LIBMAXMINDDB_VERSION=1.5.0
 ARG WATCH_VERSION=0.3.1