Bump node from 20 to 21

Bumps node from 20 to 21.

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

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM node:20
+FROM node:21
 ENV NODE_ENV=production
 WORKDIR /app
 COPY ["package.json", "package-lock.json*", "npm-shrinkwrap.json*", "./"]