chore(deps): update node.js to v22.16.0

Author: renovate[bot]

backend/Dockerfile

@@ -1,13 +1,13 @@
 # Build
-FROM node:22.15.1-slim AS build
+FROM node:22.16.0-slim AS build
 
 # Copy, build static files; see .dockerignore for exclusions
 WORKDIR /app
 COPY . ./
 RUN npm run deploy
 
 # Dependencies
-FROM node:22.15.1-slim AS dependencies
+FROM node:22.16.0-slim AS dependencies
 
 # Copy, build static files; see .dockerignore for exclusions
 WORKDIR /app