android: bump android build/compile version to match latest RN

Author: zxcpoiu

android/build.gradle

@@ -5,12 +5,12 @@ def safeExtGet(prop, fallback) {
 }
 
 android {
-    compileSdkVersion safeExtGet('compileSdkVersion', 23)
-    buildToolsVersion safeExtGet('buildToolsVersion', "23.0.1")
+    compileSdkVersion safeExtGet('compileSdkVersion', 30)
+    buildToolsVersion safeExtGet('buildToolsVersion', "30.0.2")
 
     defaultConfig {
-        minSdkVersion safeExtGet('minSdkVersion', 16)
-        targetSdkVersion safeExtGet('targetSdkVersion', 22)
+        minSdkVersion safeExtGet('minSdkVersion', 21)
+        targetSdkVersion safeExtGet('targetSdkVersion', 30)
         versionCode 1
         versionName "1.0"
     }