checkout v4

Author: ualjjcanada

.github/workflows/build.yml

@@ -13,7 +13,7 @@ jobs:
     runs-on: ubuntu-latest
     container: asciidoctor/docker-asciidoctor
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Install dependencies
         run: |