chore(deps): bump node

Bumps the dotnet-sdk-updates group in /EssentialCSharp.Web with 1 update: node.


Updates `node` from 24-bookworm-slim to 25-bookworm-slim

---
updated-dependencies:
- dependency-name: node
  dependency-version: 25-bookworm-slim
  dependency-type: direct:production
  dependency-group: dotnet-sdk-updates
...

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

Author: dependabot[bot]

EssentialCSharp.Web/Dockerfile

@@ -5,7 +5,7 @@ WORKDIR /app
 EXPOSE 8080
 EXPOSE 8081
 
-FROM node:24-bookworm-slim AS frontend-build
+FROM node:25-bookworm-slim AS frontend-build
 WORKDIR /frontend/EssentialCSharp.Web
 COPY EssentialCSharp.Web/package.json EssentialCSharp.Web/package-lock.json ./
 RUN npm ci