Bump org.jetbrains.kotlin.android from 2.1.10 to 2.1.21

Bumps [org.jetbrains.kotlin.android](https://github.com/JetBrains/kotlin) from 2.1.10 to 2.1.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v2.1.10...v2.1.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.android
  dependency-version: 2.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -2,7 +2,7 @@
 
 plugins {
     id("com.android.application") version "8.10.1" apply false
-    id("org.jetbrains.kotlin.android") version "2.1.10" apply false
+    id("org.jetbrains.kotlin.android") version "2.1.21" apply false
 }
 
 allprojects {