Add namespace required by newer Gradle version

Author: DavidBertet

android/build.gradle

@@ -2,6 +2,7 @@ apply plugin: 'com.android.library'
 apply plugin: 'kotlin-android'
 
 android {
+    namespace "com.rncamerakit"
     compileSdkVersion 31
     defaultConfig {
         minSdkVersion 24