Bump actions/checkout to v4

Update actions/checkout to v4.

Author: martincostello

.github/workflows/build.yml

@@ -22,7 +22,7 @@ jobs:
     steps:
 
     - name: Checkout code
-      uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Setup Node
       uses: actions/setup-node@v3