Include Node.js v20 in CI

They seem to have fixed the relevant vm bugs.

.github/workflows/jsdom-ci.yml

@@ -1,7 +1,3 @@
-# This workflow will do a clean install of node dependencies, build the source code and
-# run tests across different versions of node
-# For more information see: https://help.github.com/actions/language-and-framework-guides/using-nodejs-with-github-actions
-
 name: JSDOM-CI
 
 on:
@@ -25,7 +21,7 @@ jobs:
       - name: Run linter
         uses: actions/setup-node@v3
         with:
-          node-version: '18'
+          node-version: '20'
       - name: Install dependencies
         run: yarn --frozen-lockfile
       - name: Run syntax rules check with ESLint
@@ -41,7 +37,7 @@ jobs:
       - name: Run Canvas tests with Node 18
         uses: actions/setup-node@v3
         with:
-          node-version: '18'
+          node-version: '20'
       - name: Install required image manipulation packages with APT
         run: sudo apt-get install build-essential libcairo2-dev libpango1.0-dev libjpeg-dev libgif-dev librsvg2-dev
       - name: Setup HOSTS file for Web Platform Test server
@@ -58,8 +54,7 @@ jobs:
         node-version:
           - 16
           - 18
-        architecture:
-          - x64
+          - 20
     steps:
     - uses: actions/checkout@v3
       with:
@@ -68,7 +63,6 @@ jobs:
       uses: actions/setup-node@v3
       with:
         node-version: ${{ matrix.node-version }}
-        architecture: ${{ matrix.architecture }}
     - name: Setup HOSTS file for Web Platform Test server
       run: ./test/web-platform-tests/tests/wpt make-hosts-file | sudo tee -a /etc/hosts
     - name: Install dependencies