Bump org.jetbrains.kotlin:kotlin-gradle-plugin

Bumps the gradle-dependencies group with 1 update: [org.jetbrains.kotlin:kotlin-gradle-plugin](https://github.com/JetBrains/kotlin).


Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 2.1.20 to 2.1.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.20...v2.1.21)

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

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

Author: dependabot[bot]

build.gradle

@@ -11,7 +11,7 @@ buildscript {
         classpath "com.android.tools.build:gradle:8.10.0"
 
         //Kotlin
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.1.20"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:2.1.21"
 
         //AOP
         classpath "com.ibotta:plugin:1.4.1"