Update dependency org.jetbrains.kotlin:kotlin-gradle-plugin to v1.8.20

Author: renovate[bot]

build.gradle

@@ -8,7 +8,7 @@ buildscript {
 
     dependencies {
         classpath 'com.android.tools.build:gradle:7.3.1'
-        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.10'
+        classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.20'
 
         classpath 'com.vanniktech:gradle-maven-publish-plugin:0.20.0'
         classpath 'org.jetbrains.dokka:dokka-gradle-plugin:1.7.20'