build(deps): Bump org.jetbrains.kotlin.android from 2.1.0 to 2.1.20

Bumps [org.jetbrains.kotlin.android](https://github.com/JetBrains/kotlin) from 2.1.0 to 2.1.20.
- [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/v2.1.0...v2.1.20)

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

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

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 plugin-api = "1.0.0"
 android-gradle-plugin = "8.7.3"
-kotlin = "2.1.0"
+kotlin = "2.1.20"
 
 [libraries]
 plugin-api = { group = "app.revanced", name = "revanced-manager-downloader-api", version.ref = "plugin-api" }