Add namespace to make it compatible with gradle 8

Author: ciriousjoker

android/build.gradle

@@ -27,6 +27,11 @@ project.getTasks().withType(JavaCompile){
 apply plugin: 'com.android.library'
 
 android {
+    // Conditional for compatibility with AGP <4.2.
+    if (project.android.hasProperty("namespace")) {
+      namespace 'io.flutter.plugins.vikram25897.cached_video_player'
+    }
+
     compileSdkVersion 29
 
     defaultConfig {