Switch to Node.js 20 for Docker image

Author: bkimminich

Dockerfile

@@ -1,12 +1,12 @@
-FROM node:18 as installer
+FROM node:20 as installer
 COPY . /juice-shop-ctf
 WORKDIR /juice-shop-ctf
 RUN chown -R node .
 USER node
 ARG DEV_BUILD=false
 RUN if [ ${DEV_BUILD} = true ]; then npm i && npm lint && npm test && npm run e2e; else npm install --production --unsafe-perm; fi
 
-FROM node:18-alpine
+FROM node:20-alpine
 ARG BUILD_DATE
 ARG VCS_REF
 LABEL maintainer="Bjoern Kimminich <[email protected]>" \