Bump org.jetbrains.kotlin:kotlin-gradle-plugin from 2.2.20 to 2.2.21

Bumps [org.jetbrains.kotlin:kotlin-gradle-plugin](https://github.com/JetBrains/kotlin) from 2.2.20 to 2.2.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.2.20...v2.2.21)

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

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

Author: dependabot[bot]

build.gradle.kts

@@ -7,7 +7,7 @@ buildscript {
 
     dependencies {
         classpath("com.android.tools.build:gradle:8.13.0")
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.2.20")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.2.21")
         classpath("org.jlleitschuh.gradle:ktlint-gradle:12.1.2")
         classpath("com.google.gms:google-services:4.4.4")
         classpath("com.google.firebase:firebase-crashlytics-gradle:2.9.9")