Bump kotlin_version from 1.4.10 to 1.4.20

Bumps `kotlin_version` from 1.4.10 to 1.4.20.

Updates `kotlin-gradle-plugin` from 1.4.10 to 1.4.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.4.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.4.10...v1.4.20)

Updates `kotlin-stdlib-jdk7` from 1.4.10 to 1.4.20
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.4.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.4.10...v1.4.20)

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

Author: dependabot[bot]

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.4.10'
+    ext.kotlin_version = '1.4.20'
     repositories {
         google()
         jcenter()