version updates

build.gradle

@@ -1,12 +1,13 @@
 // Top-level build file where you can add configuration options common to all sub-projects/modules.
 buildscript {
-    ext.kotlin_version = "1.4.10"
+    ext.kotlin_version = "1.6.20"
     repositories {
+        mavenCentral()
         google()
-        jcenter()
+        maven { url "https://plugins.gradle.org/m2/" }
     }
     dependencies {
-        classpath "com.android.tools.build:gradle:4.1.0"
+        classpath 'com.android.tools.build:gradle:7.1.3'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
 
         // NOTE: Do not place your application dependencies here; they belong
@@ -16,8 +17,8 @@ buildscript {
 
 allprojects {
     repositories {
+        mavenCentral()
         google()
-        jcenter()
     }
 }