Bump kotlin from 2.0.20 to 2.1.20-rigel-276

Bumps `kotlin` from 2.0.20 to 2.1.20-rigel-276.

Updates `org.jetbrains.kotlin:kotlin-test` from 2.0.20 to 2.1.20-rigel-276
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Updates `org.jetbrains.kotlin.multiplatform` from 2.0.20 to 2.1.20-rigel-276
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

Updates `org.jetbrains.kotlin.plugin.compose` from 2.0.20 to 2.1.20-rigel-276
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-test
  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
- dependency-name: org.jetbrains.kotlin.plugin.compose
  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

@@ -1,6 +1,6 @@
 [versions]
 agp = "8.2.2"
-kotlin = "2.0.20"
+kotlin = "2.1.20-rigel-276"
 kotlinxSerializationJsonVersion = "1.7.3"
 nexus-publish = "2.0.0-rc-1"
 android-minSdk = "24"