Update CI GitHub Actions workflow.

Author: uhafner

.github/workflows/ci.yml

@@ -18,10 +18,12 @@ jobs:
 
     steps:
     - uses: actions/[email protected]
-    - name: Set up JDK 8
-      uses: actions/setup-java@v1
+    - name: Set up JDK 11
+      uses: actions/setup-java@v2
       with:
-        java-version: 1.8
+        distribution: 'adopt'
+        java-version: '11'
+        check-latest: true
     - name: Cache local Maven repository
       uses: actions/[email protected]
       with: