Update nginx Docker tag to v1.31.1

Author: renovate[bot]

libs/dev/reverse-proxy/docker-compose.yml

@@ -2,7 +2,7 @@ version: '3.7'
 
 services:
   reverse-proxy:
-    image: nginx:1.23.1-alpine
+    image: nginx:1.31.1-alpine
     tty: true
     ports:
       - 80:80