Bump kotlin from 2.0.20 to 2.1.0

Bumps `kotlin` from 2.0.20 to 2.1.0.

Updates `org.jetbrains.kotlin:kotlin-gradle-plugin` from 2.0.20 to 2.1.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.1.0/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.1.0)

Updates `org.jetbrains.kotlin.android` from 2.0.20 to 2.1.0

Updates `org.jetbrains.kotlin.plugin.serialization` from 2.0.20 to 2.1.0

Updates `org.jetbrains.kotlin.multiplatform` from 2.0.20 to 2.1.0

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

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -12,7 +12,7 @@ androidxLifecycle = "2.8.6"
 androidxNavigation = "2.5.0"
 androidxTest = "1.6.1"
 androidxJunit = "1.2.1"
-kotlin = "2.0.20"
+kotlin = "2.1.0"
 atomicfu = "0.25.0"
 dokka = "1.9.0"
 kluent = "1.73"