Bump kotlinx-serialization from 1.8.1 to 1.9.0

Bumps `kotlinx-serialization` from 1.8.1 to 1.9.0.

Updates `org.jetbrains.kotlinx:kotlinx-serialization-core` 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)

Updates `org.jetbrains.kotlinx:kotlinx-serialization-json` 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-core
  dependency-version: 1.9.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- 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] <support@github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -9,7 +9,7 @@ jmh-core = "1.37"
 benchmark = "0.4.14"
 junit5-jupiter = "5.11.4"
 kotlin = "2.2.0"
-kotlinx-serialization = "1.8.1"
+kotlinx-serialization = "1.9.0"
 kotlinx-io = "0.8.0"
 kxml2 = "2.3.0"
 woodstox = "7.1.0"