build(deps): bump org.jetbrains.kotlin:kotlin-gradle-plugin (#143)

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/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

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

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Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -22,7 +22,7 @@ coil-compose = "io.coil-kt:coil-compose:2.7.0"
 google-guava = "com.google.guava:guava:33.3.1-android"
 google-oss-licenses = "com.google.android.gms:play-services-oss-licenses:17.1.0"
 google-oss-licenses-plugin = "com.google.android.gms:oss-licenses-plugin:0.10.6"
-kotlin-gradle-plugin = "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.20"
+kotlin-gradle-plugin = "org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21"
 kotlin-serialization-plugin = "org.jetbrains.kotlin:kotlin-serialization:2.0.20"
 kotlinx-coroutines-android = "org.jetbrains.kotlinx:kotlinx-coroutines-android:1.9.0"
 kotlinx-coroutines-core = "org.jetbrains.kotlinx:kotlinx-coroutines-core:1.9.0"