Update to node20

- updates many dependencies
- removes @nuxtjs/tailwindcss and postcss8
- pkg targets are using node18 until node20 targets are available

Dockerfile

@@ -1,5 +1,5 @@
 ### STAGE 0: Build client ###
-FROM node:16-alpine AS build
+FROM node:20-alpine AS build
 WORKDIR /client
 COPY /client /client
 RUN npm ci && npm cache clean --force
@@ -7,7 +7,7 @@ RUN npm run generate
 
 ### STAGE 1: Build server ###
 FROM sandreas/tone:v0.1.5 AS tone
-FROM node:16-alpine
+FROM node:20-alpine
 
 ENV NODE_ENV=production