chore: update node base images (#54026)

docker/api/Dockerfile

@@ -1,5 +1,4 @@
-# bookworm was only released on 10-6-2023, so is a little too new.
-FROM node:18-bullseye AS builder
+FROM node:20-bookworm AS builder
 # global installs need root permissions, so have to happen before we switch to
 # the node user
 RUN npm i -g pnpm@8
@@ -34,7 +33,7 @@ RUN pnpm build:curriculum
 
 RUN pnpm build:server
 
-FROM node:18-bullseye AS deps
+FROM node:20-bookworm AS deps
 
 WORKDIR /home/node/build
 COPY --chown=node:node pnpm*.yaml .
@@ -46,7 +45,7 @@ RUN npm i -g pnpm@8
 RUN pnpm config set dedupe-peer-dependents false
 RUN pnpm -F=api-server -F=shared install --prod --ignore-scripts
 
-FROM node:18-alpine
+FROM node:20-alpine
 RUN npm i -g pm2@4
 USER node
 WORKDIR /home/node/fcc