fix(deps): update dependency org.jetbrains.kotlin:kotlin-gradle-plugin to v1.8.21 (#267)

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

Author: renovate[bot]

build.gradle

@@ -2,7 +2,7 @@ import org.gradle.api.internal.classpath.ModuleRegistry
 import org.gradle.api.internal.project.ProjectInternal
 
 buildscript {
-  ext.kotlinVersion = '1.8.20'
+  ext.kotlinVersion = '1.8.21'
   ext.androidGradlePluginVersion = '7.3.1'
 
   repositories {