Bump node from 20-alpine3.18 to 21-alpine3.18

Bumps node from 20-alpine3.18 to 21-alpine3.18.

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

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

Dockerfile

@@ -14,7 +14,7 @@ RUN apk add --update --no-cache ca-certificates shadow && \
 ###################
 # UI build stage
 ###################
-FROM --platform=$BUILDPLATFORM node:20-alpine3.18 AS ui-builder
+FROM --platform=$BUILDPLATFORM node:21-alpine3.18 AS ui-builder
 WORKDIR /src
 COPY ["ui/package.json", "ui/yarn.lock", "./"]
 RUN yarn install --network-timeout 200000 && \