Bump org.jetbrains.kotlin:kotlin-gradle-plugin from 2.0.21 to 2.1.20

Bumps [org.jetbrains.kotlin:kotlin-gradle-plugin](https://github.com/JetBrains/kotlin) from 2.0.21 to 2.1.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.21...v2.1.20)

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

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

build.gradle.kts

@@ -14,7 +14,7 @@ buildscript {
     }
     dependencies {
         classpath("com.android.tools.build:gradle:8.9.1")
-        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.0.21")
+        classpath("org.jetbrains.kotlin:kotlin-gradle-plugin:2.1.20")
         classpath("com.mikepenz.aboutlibraries.plugin:aboutlibraries-plugin:11.6.3")
     }
 }