Roll to build tools 30.0.2 (#484)

diff --git a/build/config/android/config.gni b/build/config/android/config.gni
index 4e5be79..f720442 100644
--- a/build/config/android/config.gni
+++ b/build/config/android/config.gni
@@ -17,7 +17,7 @@
   if (!defined(default_android_sdk_root)) {
     default_android_sdk_root = "//third_party/android_tools/sdk"
     default_android_sdk_version = "30"
-    default_android_sdk_build_tools_version = "30.0.1"
+    default_android_sdk_build_tools_version = "30.0.2"
   }
 
   declare_args() {