Update the GitHub Actions workflows to use the current Node.js LTS version

The active LTS version is now based on Node.js version 20, hence let's update the relevant workflows to use that one instead; see https://en.wikipedia.org/wiki/Node.js#Releases

Given that we still support Node.js version 18, i.e. the maintenance LTS version, in the PDF.js library we'll keep testing both versions in GitHub Actions to prevent regressions.

.github/workflows/ci.yml

@@ -8,16 +8,20 @@ jobs:
     name: Test
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        node-version: [18, lts/*]
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: Use Node.js 18 LTS
+      - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: ${{ matrix.node-version }}
 
       - name: Install Gulp
         run: npm install -g gulp-cli

.github/workflows/publish_website.yml

@@ -11,16 +11,20 @@ jobs:
     name: Build
     runs-on: ubuntu-latest
 
+    strategy:
+      matrix:
+        node-version: [lts/*]
+
     steps:
       - name: Checkout repository
         uses: actions/checkout@v4
         with:
           fetch-depth: 0
 
-      - name: Use Node.js 18 LTS
+      - name: Use Node.js ${{ matrix.node-version }}
         uses: actions/setup-node@v4
         with:
-          node-version: '18'
+          node-version: ${{ matrix.node-version }}
 
       - name: Install Gulp
         run: npm install -g gulp-cli