Bump org.jetbrains.kotlin.android from 2.2.0 to 2.2.21 in /android (#443)

Bumps [org.jetbrains.kotlin.android](https://github.com/JetBrains/kotlin) from 2.2.0 to 2.2.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.2.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.2.0...v2.2.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.android
  dependency-version: 2.2.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

android/settings.gradle

@@ -19,7 +19,7 @@ pluginManagement {
 
 plugins {
     id "dev.flutter.flutter-plugin-loader" version "1.0.0"
-    id "org.jetbrains.kotlin.android" version "2.2.0" apply false
+    id "org.jetbrains.kotlin.android" version "2.2.21" apply false
     id "com.android.application" version '8.10.1' apply false
     id 'com.google.gms.google-services' version '4.4.4' apply false