Update CI.yml

Author: maximiliani

.github/workflows/CI.yml

@@ -76,10 +76,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v3
-      - name: Set up JDK 17
+      - name: Set up JDK 11
         uses: actions/setup-java@v3
         with:
-          java-version: '17'
+          java-version: '11'
           distribution: 'adopt'
       - name: Validate Gradle wrapper
         uses: gradle/wrapper-validation-action@e6e38bacfdf1a337459f332974bb2327a31aaf4b