Use actions/checkout@v4 and remove version from docker-compose file (#4574)

Author: thomashohn

.github/workflows/acceptance-tests.yml

@@ -25,7 +25,7 @@ jobs:
     steps:
       # Checkout the repository
       - name: Checkout Repository
-        uses: actions/checkout@v3
+        uses: actions/checkout@v4
 
       # Install Docker Compose
       - name: Install Docker Compose

test/docker-compose.yml

@@ -1,4 +1,3 @@
-version: '3'
 services:
   test-rest:
     <<: &test-service