fixes java version

Author: jurgenvinju

.github/workflows/build.yaml

@@ -17,10 +17,10 @@ jobs:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/checkout@v2
-      - name: Set up JDK 1.8
+      - name: Set up JDK
         uses: actions/setup-java@v1
         with:
-          java-version: 1.8
+          java-version: 11
 
       - name: Cache Maven packages
         uses: actions/cache@v2