Update Node.js to v21

Dockerfile

-FROM --platform=$BUILDPLATFORM public.ecr.aws/docker/library/node:20.9-alpine@sha256:807e66e2bee193961c9642bb1157d77a61747bf76737ca786da45b10749dcb42 AS buildJS
+FROM --platform=$BUILDPLATFORM public.ecr.aws/docker/library/node:21.1-alpine@sha256:10e00fa540cafb2f1bd7592d042b3de22f92e447a7415b1841339afe940df8c4 AS buildJS
 WORKDIR /app
 COPY . ./
 RUN yarn install --frozen-lockfile && \