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

Bumps [org.jetbrains.kotlinx:kotlinx-serialization-json](https://github.com/Kotlin/kotlinx.serialization) from 1.6.3 to 1.8.1.
- [Release notes](https://github.com/Kotlin/kotlinx.serialization/releases)
- [Changelog](https://github.com/Kotlin/kotlinx.serialization/blob/master/CHANGELOG.md)
- [Commits](Kotlin/kotlinx.serialization@v1.6.3...v1.8.1)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlinx:kotlinx-serialization-json
  dependency-version: 1.8.1
  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 @@ kodein = "7.11.0"
 coroutines = "1.8.0"
 korau = "2.2.0"
 kotlinx-collections-immutable = "0.3.5"
-kotlinx-serialization-json = "1.6.3"
+kotlinx-serialization-json = "1.8.1"
 ktor = "2.3.12"
 mockk = "1.13.7"
 moko-resources = "0.24.0-beta-1"