Bump org.jetbrains.kotlin.multiplatform from 2.1.21 to 2.2.20

Bumps [org.jetbrains.kotlin.multiplatform](https://github.com/JetBrains/kotlin) from 2.1.21 to 2.2.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.21...v2.2.20)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.multiplatform
  dependency-version: 2.2.20
  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

@@ -2,7 +2,7 @@
 
 # kotlin version > 2.1.x do not support kotlin 2.0 competability
 # see https://github.com/oshai/kotlin-logging/issues/546
-kotlin = "2.1.21"
+kotlin = "2.2.20"
 android-gradle-plugin = "8.13.0"
 dokka = "2.0.0"
 spotless = "7.2.1"