chore(deps): update dependency nginx to v1.21.6

Author: renovate-bot

tools/nginx/Dockerfile

@@ -1,4 +1,4 @@
-FROM nginx:1.21.3-alpine
+FROM nginx:1.21.6-alpine
 COPY /dist /usr/share/nginx/html
 EXPOSE 80
 CMD ["nginx", "-g", "daemon off;"]