chore(deps): bump node from 20.5.1 to 21.1.0 in /frontend

Bumps node from 20.5.1 to 21.1.0.

---
updated-dependencies:
- dependency-name: node
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

frontend/Dockerfile

@@ -1,7 +1,7 @@
 # syntax=docker/dockerfile:1
 
 ### Build executable
-FROM node:20.5.1 as builder
+FROM node:21.1.0 as builder
 WORKDIR /workspace
 COPY package.json package-lock.json ./
 RUN --mount=type=cache,target=/workspace/.npm \