fix: downgrade sdk target

android/variables.gradle

@@ -1,7 +1,7 @@
 ext {
     minSdkVersion = 21
-    compileSdkVersion = 30
-    targetSdkVersion = 30
+    compileSdkVersion = 29
+    targetSdkVersion = 29
     androidxActivityVersion = '1.2.0'
     androidxAppCompatVersion = '1.2.0'
     androidxCoordinatorLayoutVersion = '1.1.0'