Update gradle and SDK versions.

build.gradle

@@ -8,15 +8,15 @@
 
 ext {
     kotlin_version = '1.4.10'
-    gradle_version = '4.0.0'
+    gradle_version = '4.0.1'
-    compileSdkVersion = 28
+    compileSdkVersion = 30
-    buildToolsVersion = '29.0.3'
+    buildToolsVersion = '30.0.2'
 }
 
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
     ext.kotlin_version = '1.4.10'
-    ext.gradle_version = '4.0.0'
+    ext.gradle_version = '4.0.1'
 
     repositories {
         jcenter()