update unit test action java version

Author: l-trotta

.github/workflows/unit-tests.yml

@@ -14,10 +14,10 @@ jobs:
     steps:
       - uses: actions/checkout@v3
 
-      - name: Set up JDK 8
+      - name: Set up JDK 17
         uses: actions/setup-java@v3
         with:
-          java-version: '8'
+          java-version: '17'
           distribution: 'temurin'
 
       - name: Run java client tests