update pipeline to java 11

Author: eusorov

.github/workflows/build.yml

@@ -16,10 +16,10 @@ jobs:
 
     steps:
       - uses: actions/checkout@v2
-      - name: Set up JDK 8
+      - name: Set up JDK 11
         uses: actions/setup-java@v2
         with:
-          java-version: '8'
+          java-version: '11'
           distribution: 'adopt'
           cache: gradle
       - name: Grant execute permission for gradlew