chore: update to Node.js 20 (#429)

Author: timdeschryver

.devcontainer/devcontainer.json

@@ -1,7 +1,7 @@
 // For format details, see https://aka.ms/devcontainer.json.
 {
   "name": "angular-testing-library",
-  "image": "mcr.microsoft.com/devcontainers/typescript-node:0-18-bullseye",
+  "image": "mcr.microsoft.com/devcontainers/typescript-node:0-20-bullseye",
 
   // Features to add to the dev container. More info: https://containers.dev/features.
   "features": {

.github/workflows/ci.yml

@@ -22,7 +22,7 @@ jobs:
 
     strategy:
       matrix:
-        node-version: ${{ fromJSON((github.ref == 'refs/heads/main' || github.ref == 'refs/heads/beta') && '[16]' || '[16, 18]') }}
+        node-version: ${{ fromJSON((github.ref == 'refs/heads/main' || github.ref == 'refs/heads/beta') && '[20]' || '[16, 18, 20]') }}
         os: ${{ fromJSON((github.ref == 'refs/heads/main' || github.ref == 'refs/heads/beta') && '["ubuntu-latest"]' || '["ubuntu-latest", "windows-latest"]') }}
     runs-on: ${{ matrix.os }}
 

.node-version

@@ -1 +1 @@
-16
+20