Chore(deps): Bump org.jetbrains.kotlin:kotlin-gradle-plugin

Bumps [org.jetbrains.kotlin:kotlin-gradle-plugin](https://github.com/JetBrains/kotlin) from 2.0.20 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](JetBrains/kotlin@v2.0.20...v2.0.21)

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

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

build.gradle

@@ -9,7 +9,7 @@ buildscript {
  dependencies {
  classpath 'com.android.tools.build:gradle:8.6.1'
  //noinspection DifferentKotlinGradleVersion
- classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.20"
+ classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21"
 
  // NOTE: Do not place your application dependencies here; they belong
  // in the individual module build.gradle files