chore(deps): bump nginx from 1.28-alpine to 1.31-alpine in /dashboard (#43)

Bumps nginx from 1.28-alpine to 1.31-alpine.

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

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Author: dependabot[bot]

dashboard/Dockerfile

@@ -9,7 +9,7 @@ RUN pnpm install --frozen-lockfile
 COPY . .
 RUN pnpm build
 
-FROM nginx:1.28-alpine@sha256:a8b39bd9cf0f83869a2162827a0caf6137ddf759d50a171451b335cecc87d236
+FROM nginx:1.31-alpine@sha256:4a73073bd557c65b759505da037898b61f1be6cbcc3c2c3aeac22d2a470c1752
 COPY --from=build /app/dist /usr/share/nginx/html
 COPY nginx.conf /etc/nginx/conf.d/default.conf
 EXPOSE 80