set jdk 1.8 to 11

.github/workflows/android.yml

@@ -14,7 +14,7 @@ jobs:
     steps:
     - uses: actions/checkout@v2
 
-    - name: set up JDK 1.8
+    - name: set up JDK 11
       uses: actions/setup-java@v1
       with:
         java-version: 11