update build.gradle

Author: Creeper19472

src/serious_python_android/android/build.gradle

@@ -4,6 +4,11 @@ version '0.9.4'
 def python_version = '3.12'
 
 buildscript {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
     dependencies {
         classpath 'de.undercouch:gradle-download-task:5.6.0'
     }