build(deps): Bump org.jetbrains.kotlin:kotlin-gradle-plugin

Bumps [org.jetbrains.kotlin:kotlin-gradle-plugin](https://github.com/JetBrains/kotlin) from 1.8.22 to 1.9.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

---
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]>

gradle/libs.versions.toml

@@ -1,6 +1,6 @@
 [versions]
 # https://kotlinlang.org/docs/releases.html#release-details
-kotlin = "1.8.22"
+kotlin = "1.9.20"
 # https://github.com/Kotlin/kotlinx.coroutines
 kotlin-coroutines = "1.7.3"
 # https://github.com/FasterXML/jackson