Update build.yml

Author: kevinfarrugia

.github/workflows/build.yml

@@ -15,7 +15,7 @@ jobs:
 
     steps:
     - name: Checkout the repository
-    - uses: actions/checkout@v3
+      uses: actions/checkout@v4
 
     - name: Build the Docker image
       run: docker build . --tag yellowlabtools:$(date +%s)