bump nodejs version

Dockerfile

@@ -1,11 +1,11 @@
-FROM node:18-bullseye AS builder
+FROM node:26-bullseye AS builder
 
 WORKDIR /devel
 RUN apt-get update ; apt-get upgrade -y ; apt-get install -y build-essential
 COPY . .
 RUN npm i ; npm run build
 
-FROM node:20-alpine
+FROM node:26-alpine
 
 EXPOSE 8080
 WORKDIR /exec