🔧 update checkout@v3 to checkout@v4 on all actions + update test lib (#193)

Author: sebastianMindee

.github/workflows/test-code-samples.yml

@@ -23,7 +23,7 @@ jobs:
           - "temurin"
 
     steps:
-      - uses: actions/checkout@v3
+      - uses: actions/checkout@v4
         with:
           submodules: recursive
       - name: Set up JDK ${{ matrix.java-version }}