docker(deps): bump nginx from 1.31.4-alpine to 1.31.5-alpine

Bumps nginx from 1.31.4-alpine to 1.31.5-alpine.

---
updated-dependencies:
- dependency-name: nginx
  dependency-version: 1.31.5-alpine
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

Dockerfile

@@ -24,7 +24,7 @@ ENV PORT=$PORT
 RUN npm install && npm run build
 
 # Stage 2: Final container with nginx + Node.js server
-FROM nginx:1.31.4-alpine
+FROM nginx:1.31.5-alpine
 
 # Install Node.js and curl for healthcheck
 # Using Alpine Linux for smaller image size