Bump org.jetbrains.kotlin.android from 2.0.20 to 2.0.21 (#25)

Bumps [org.jetbrains.kotlin.android](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.android
  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>

build.gradle.kts

@@ -2,6 +2,6 @@
 plugins {
     id("com.android.application") version "8.7.0" apply false
     id("com.android.library") version "8.7.0" apply false
-    id("org.jetbrains.kotlin.android") version "2.0.20" apply false
+    id("org.jetbrains.kotlin.android") version "2.0.21" apply false
     id("com.mikepenz.aboutlibraries.plugin") version "11.2.3" apply false
 }