Updated gradle, kotlin, sdk version

Author: li2

build.gradle

@@ -1,8 +1,10 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 
 buildscript {
-    ext.kotlin_version = '1.4.32'
-    ext.gradle_version = '4.1.2'
+    ext {
+        kotlin_version = '1.5.21'
+        gradle_version = '7.0.3'
+    }
     repositories {
         google()
         jcenter()
@@ -26,9 +28,9 @@ allprojects {
     }
     ext {
         // Build
-        androidCompileSdk_version = 29
+        androidCompileSdk_version = 30
         androidMinSdk_version = 19
-        androidTargetSdk_version = 29
+        androidTargetSdk_version = 30
 
         // Android X Dependencies
         androidx_appcompat_version = '1.1.0'