Update Node.js to v20

Author: renovate[bot]

Dockerfile

@@ -1,11 +1,11 @@
-FROM node:19 AS BUILD_IMAGE
+FROM node:20 AS BUILD_IMAGE
 WORKDIR /build
 COPY . .
 ARG PUPPETEER_SKIP_CHROMIUM_DOWNLOAD=true
 RUN npm install
 RUN npm run build
 
-FROM node:19-alpine
+FROM node:20-alpine
 WORKDIR /usr/src/pow-shield
 COPY --from=BUILD_IMAGE /build/dist .
 COPY --from=BUILD_IMAGE /build/node_modules ./node_modules