Bump org.jetbrains.kotlinx:kotlinx-serialization-json

Bumps [org.jetbrains.kotlinx:kotlinx-serialization-json](https://github.com/Kotlin/kotlinx.serialization) from 1.8.1 to 1.9.0.
- [Release notes](https://github.com/Kotlin/kotlinx.serialization/releases)
- [Changelog](https://github.com/Kotlin/kotlinx.serialization/blob/master/CHANGELOG.md)
- [Commits](Kotlin/kotlinx.serialization@v1.8.1...v1.9.0)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlinx:kotlinx-serialization-json
  dependency-version: 1.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -21,7 +21,7 @@ kotlin = "2.2.0"
 kotlinpoet = "2.2.0"
 kotlinx-atomicfu = "0.29.0"
 kotlinx-coroutines = "1.10.2"
-kotlinx-serialization = "1.8.1"
+kotlinx-serialization = "1.9.0"
 ktor = "3.2.1"
 nexus-publish-plugin = "2.0.0"
 slf4j = "2.0.17"