Bump node from 16-alpine to 22-alpine

Bumps node from 16-alpine to 22-alpine.

---
updated-dependencies:
- dependency-name: node
  dependency-type: direct:production
...

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

Dockerfile

@@ -1,4 +1,4 @@
-FROM --platform=$BUILDPLATFORM node:16-alpine AS frontend-build
+FROM --platform=$BUILDPLATFORM node:22-alpine AS frontend-build
 WORKDIR /tmp
 COPY static/package*.json ./
 COPY static/src ./src