chore(deps): 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]

build.gradle.kts

@@ -97,7 +97,7 @@ dependencies {
 //
 //    implementation("com.knuddels:jtokkit:1.0.0")
 
-    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.8.1")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.0")
 
     // langchain4j integrations
     implementation(platform("dev.langchain4j:langchain4j-bom:1.0.1"))