Update example to 0.66.0

Example/testHotUpdate/android/build.gradle

@@ -2,18 +2,18 @@
 
 buildscript {
     ext {
-        buildToolsVersion = "29.0.3"
+        buildToolsVersion = "30.0.2"
         minSdkVersion = 21
-        compileSdkVersion = 29
-        targetSdkVersion = 29
-        ndkVersion = "20.1.5948944"
+        compileSdkVersion = 30
+        targetSdkVersion = 30
+        ndkVersion = "21.4.7075529"
     }
     repositories {
         google()
-        jcenter()
+        mavenCentral()
     }
     dependencies {
-        classpath('com.android.tools.build:gradle:4.1.0')
+        classpath('com.android.tools.build:gradle:4.2.2')
 
         // NOTE: Do not place your application dependencies here; they belong
         // in the individual module build.gradle files
@@ -22,6 +22,7 @@ buildscript {
 
 allprojects {
     repositories {
+        mavenCentral()
         mavenLocal()
         maven {
             // All of React Native (JS, Obj-C sources, Android binaries) is installed from npm
@@ -33,7 +34,6 @@ allprojects {
         }
 
         google()
-        jcenter()
         maven { url 'https://www.jitpack.io' }
     }
 }