Update dependency org.jetbrains.kotlin:kotlin-gradle-plugin to v2.2.21 (#334)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

build.gradle

@@ -49,7 +49,7 @@ buildscript {
 
   dependencies {
     classpath 'com.android.tools.build:gradle:8.13.0'
-    classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:2.2.20'
+    classpath 'org.jetbrains.kotlin:kotlin-gradle-plugin:2.2.21'
     classpath 'org.jetbrains.dokka:dokka-gradle-plugin:2.1.0'
     classpath 'com.vanniktech:gradle-code-quality-tools-plugin:0.24.0'
     classpath 'com.vanniktech:gradle-maven-publish-plugin:0.34.0'