fix(deps): update docker base image

Dockerfile

@@ -1,7 +1,7 @@
 # Lightweight, non-root nginx serving the static site.
 # Runs as user "nginx" and listens on 8080, ready to sit behind an
 # external reverse proxy that terminates TLS and forwards requests.
-FROM nginxinc/nginx-unprivileged:1.31-alpine-slim@sha256:eed3e4c2f3f9285e80610238e0b18fe1bf311c50559434db1969b1cfabd5518b
+FROM nginxinc/nginx-unprivileged:1.31-alpine-slim@sha256:d9fa63891743a11eb56ca1b22d8cc227491df183ca3da2cf1bf2c6e010bf19a5
 
 COPY default.conf /etc/nginx/conf.d/default.conf
 COPY --chown=nginx:nginx index.html styles.css script.js messages.js /usr/share/nginx/html/