Update checkout version to v4

Author: rdmueller

.github/workflows/update-dtcw.yml

@@ -15,7 +15,7 @@ jobs:
 
     # Steps represent a sequence of tasks that will be executed as part of the job
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
         with:
           fetch-depth: 0
       - name: publish-dtcw