Update kotlin to 1.4.30

Author: ZacSweers

README.md

@@ -108,7 +108,7 @@ Kotlin-Compile-Testing is compatible with all _local_ compiler versions. It does
 
 However, if your project or any of its dependencies depend directly on compiler artifacts such as `kotlin-compiler-embeddable` or `kotlin-annotation-processing-embeddable` then they have to be the same version as the one used by Kotlin-Compile-Testing or there will be a transitive dependency conflict.
 
-- Current `kotlin-compiler-embeddable` version: `1.4.21-2`
+- Current `kotlin-compiler-embeddable` version: `1.4.30`
 
 Because the internal APIs of the Kotlin compiler often change between versions, we can only support one `kotlin-compiler-embeddable` version at a time. 
 

build.gradle

@@ -1,5 +1,5 @@
 buildscript {
-    ext.kotlin_version = '1.4.21-2'
+    ext.kotlin_version = '1.4.30'
 
     repositories {
         mavenCentral()