build(deps): bump org.jetbrains.kotlin.plugin.serialization

Bumps [org.jetbrains.kotlin.plugin.serialization](https://github.com/JetBrains/kotlin) from 1.9.10 to 1.9.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/commits)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.plugin.serialization
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>

settings.gradle.kts

@@ -16,7 +16,7 @@ include("exposed-json")
 pluginManagement {
     plugins {
         id("org.jetbrains.kotlin.jvm") version "1.9.10"
-        id("org.jetbrains.kotlin.plugin.serialization") version "1.9.10"
+        id("org.jetbrains.kotlin.plugin.serialization") version "1.9.20"
     }
 }