⬆️ Bump kotlin_version from 1.4.10 to 1.4.30

Bumps `kotlin_version` from 1.4.10 to 1.4.30.

Updates `kotlin-gradle-plugin` from 1.4.10 to 1.4.30

Updates `kotlin-stdlib-jdk7` from 1.4.10 to 1.4.30
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.4.10...v1.4.30)

Signed-off-by: dependabot-preview[bot] <support@dependabot.com>

Author: dependabot-preview[bot]

build.gradle

@@ -1,7 +1,7 @@
 // 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="1.4.30"
     repositories {
         google()
         jcenter()