Bump actions/checkout from @2 to @4

Author: marc-mabe

.github/workflows/test.yml

@@ -60,7 +60,7 @@ jobs:
             RUN_BENCHMARK: false
 
     steps:
-      - uses: actions/checkout@v2
+      - uses: actions/checkout@v4
 
       - name: Cache Docker Image
         id: cache-docker-image