Downgrade AGP to stable version but use newer lint (#81)

* Downgrade AGP to stable version but use newer lint

* Downgrade Java to 17 and use newer r8

.github/workflows/ci.yml

@@ -18,11 +18,11 @@ jobs:
         with:
           submodules: 'recursive'
 
-      - name: Setup Java 21
+      - name: Setup Java 17
         uses: actions/setup-java@v3
         with:
           distribution: temurin
-          java-version: 21
+          java-version: 17
 
       - name: Install Rust Toolchain
         run: rustup update && rustup target add armv7-linux-androideabi aarch64-linux-android i686-linux-android x86_64-linux-android && rustup component add rustfmt clippy