Bump nginx from 1.29.8-alpine3.23 to 1.31.0-alpine3.23 in /frontend in the frontend-images group across 1 directory - #2

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/checkout@11d5960a326750d5838078e36cf38b85af677262. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/