Fix GitHub Actions workflows: update to latest action versions and Node.js 18/20

- Updated actions/checkout from v2/v3 to v4
- Updated actions/setup-node from v3 to v4
- Updated Node.js versions from 14.x/16.x to 18.x/20.x (LTS versions)
- Added permissions for deploy job to write contents
- Changed npm i to npm ci for reproducible builds

Author: saiyam1814

.github/workflows/deploy.yml

@@ -11,15 +11,17 @@ jobs:
   deploy:
     name: Deploy to GitHub Pages
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
     steps:
-      - uses: actions/checkout@v2
-      - uses: actions/setup-node@v3
+      - uses: actions/checkout@v4
+      - uses: actions/setup-node@v4
         with:
-          node-version: 16.x
-          cache: npm
+          node-version: '18.x'
+          cache: 'npm'
 
       - name: Install dependencies
-        run: npm i
+        run: npm ci
       - name: Build website
         run: npm run build
 

.github/workflows/node.js.yml

@@ -16,13 +16,13 @@ jobs:
 
     strategy:
       matrix:
-        node-version: [14.x, 16.x]
+        node-version: [18.x, 20.x]
         # See supported Node.js release schedule at https://nodejs.org/en/about/releases/
 
     steps:
-    - uses: actions/checkout@v3
+    - uses: actions/checkout@v4
     - name: Use Node.js ${{ matrix.node-version }}
-      uses: actions/setup-node@v3
+      uses: actions/setup-node@v4
       with:
         node-version: ${{ matrix.node-version }}
         cache: 'npm'