Update GitHub Action to work with Java 11

Author: Kaljurand

.github/workflows/android.yml

@@ -22,10 +22,11 @@ jobs:
       with:
         submodules: recursive
 
-    - name: Set up JDK 1.8
-      uses: actions/setup-java@v1
+    - name: Set up Java 11
+      uses: actions/setup-java@v2
       with:
-        java-version: 1.8
+        distribution: 'adopt'
+        java-version: '11'
 
     - name: Build with Gradle
       run: ./gradlew build