add 0.68 to build matrix (#100)

# Why

add react-native 0.68 to build matrix and remove 0.66

Author: Kudo

.github/workflows/android.yml

@@ -12,13 +12,19 @@ jobs:
     runs-on: macos-10.15
     strategy:
       matrix:
-        rn-version: [0.67, 0.66]
+        rn-version: [0.68, 0.67]
         v8-android-variant:
           [v8-android-jit, v8-android-jit-nointl, v8-android, v8-android-nointl]
 
     steps:
       - uses: actions/checkout@v2
 
+      - name: Use JDK 11
+        uses: actions/setup-java@v2
+        with:
+          distribution: 'temurin'
+          java-version: '11'
+
       - name: Run tests
         uses: reactivecircus/android-emulator-runner@v2
         with: