Bump node from 21.5.0-slim to 21.6.0-slim

Bumps node from 21.5.0-slim to 21.6.0-slim.

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

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:21.5.0-slim AS typescript-builder
+FROM node:21.6.0-slim AS typescript-builder
 SHELL ["/bin/bash", "-o", "pipefail", "-c"]
 
 COPY / /