Update actions/checkout workflow to v4

.github/workflows/pull-request.yml

@@ -8,13 +8,13 @@ jobs:
     runs-on: ubuntu-latest
 
     steps:
-    - uses: actions/checkout@v2
-    
+    - uses: actions/checkout@v4
+
     - uses: actions/setup-node@v4
       with:
         node-version: 20
         cache: 'npm'
-    
+
     - name: Install dependencies
       run: npm ci
 
@@ -25,13 +25,13 @@ jobs:
       env:
         GITHUB_TOKEN: ${{ secrets.TOKEN_GITHUB }}
         SONAR_TOKEN: ${{ secrets.SONAR_TOKEN }}
-        SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }} 
-  
+        SONAR_HOST_URL: ${{ secrets.SONAR_HOST_URL }}
+
     - name: Run linting
       run: npm run lint
-    
+
     - name: Run tests
       run: npm test
-  
+
     - name: Run backstop
       run: npm run backstop:ci