Upgrade to Node 23

Author: thibaudcolas

.nvmrc

@@ -1 +1 @@
-16
+23

docker-compose.yml

@@ -16,7 +16,7 @@ services:
 
  frontend:
  command: npm start
- image: node:16
+ image: node:23
  user: node
  volumes:
  - type: bind

docs/guides/automated-tests.md

@@ -100,7 +100,7 @@ Here is a practical example of combining [Pa11y](https://pa11y.org/) and django-
 
 ```yaml
 static:
- image: node:16
+ image: node:22
  stage: build
  script:
  - npm ci
@@ -182,7 +182,10 @@ let urls = [];
 // In CI mode, retrieve the URLs to test from dpl-rendered-patterns.
 if (process.env.CI) {
  const list = path.join(__dirname, "dpl-rendered-patterns", "dpl-list.txt");
- const patterns = fs.readFileSync(list, "utf-8").split("\n").filter((p) => p);
+ const patterns = fs
+ .readFileSync(list, "utf-8")
+ .split("\n")
+ .filter((p) => p);
 
  urls = patterns.map((p) => `${origin}/${p.replace("patterns/", "")}`);
 }