Bump node from 21.2.0-slim to 21.4.0-slim (#5039)

Bumps node from 21.2.0-slim to 21.4.0-slim.

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Dockerfile

@@ -1,5 +1,5 @@
 # syntax = docker/dockerfile:1
-FROM node:21.2.0-slim AS dependencies
+FROM node:21.4.0-slim AS dependencies
 WORKDIR /usr/src
 ARG CI
 RUN --mount=type=cache,target=/var/cache/apt \