chore(deps): bump nginx from 1.27-alpine to 1.31-alpine

Bumps nginx from 1.27-alpine to 1.31-alpine.

---
updated-dependencies:
- dependency-name: nginx
  dependency-version: 1.31-alpine
  dependency-type: direct:production
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

Dockerfile

@@ -29,7 +29,7 @@ ENV VITE_API_URL=$VITE_API_URL
 RUN npm run build:production
 
 # ── Stage 2: Serve ────────────────────────────────────────────────────────────
-FROM nginx:1.27-alpine AS runtime
+FROM nginx:1.31-alpine AS runtime
 
 # Copy built assets
 COPY --from=builder /app/dist /usr/share/nginx/html