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

---
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] <support@github.com>

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -1,7 +1,7 @@
 [versions]
 kotlin = "2.1.21"
 kotest = "6.0.0.M3"
-serialization = "1.8.1"
+serialization = "1.9.0"
 graphql = "8.8.1"
 
 [plugins]