build(deps): bump org.jetbrains.kotlinx:kotlinx-serialization-json

Bumps [org.jetbrains.kotlinx:kotlinx-serialization-json](https://github.com/Kotlin/kotlinx.serialization) from 1.7.3 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@v1.7.3...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]

Diff for: gradle/libs.versions.toml

@@ -8,7 +8,7 @@ storytale = "0.0.3+dev8"
 
 compose-plugin = "1.8.0-alpha03"
 compose-navigation = "2.9.0-alpha15"
-kotlinx-serialization-json = "1.7.3"
+kotlinx-serialization-json = "1.8.1"
 kotlin = "2.1.10"
 kotlin-poet = "1.18.1"
 build-time-config = "2.3.0"