Bump org.jetbrains.kotlin:kotlin-gradle-plugin from 1.9.23 to 2.0.21

Bumps [org.jetbrains.kotlin:kotlin-gradle-plugin](https://github.com/JetBrains/kotlin) from 1.9.23 to 2.0.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.9.23...v2.0.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-gradle-plugin
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

build.gradle.kts

@@ -14,7 +14,7 @@ buildscript {
     }
     dependencies {
         classpath("com.android.tools.build:gradle:8.4.2")
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:1.9.23")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21")
         classpath("com.mikepenz.aboutlibraries.plugin:aboutlibraries-plugin:11.2.1")
     }
 }