convert to node:20-alpine from 16

Dockerfile

@@ -1,5 +1,5 @@
 # Build stage
-FROM node:16-alpine AS build-stage
+FROM node:20-alpine AS build-stage
 
 WORKDIR /app
 
@@ -18,7 +18,7 @@ COPY styles ./styles
 RUN npm run build
 
 # Production stage
-FROM node:16-alpine AS production-stage
+FROM node:20-alpine AS production-stage
 
 WORKDIR /app
 COPY --from=build-stage /app/package.json ./package.json