Bump org.jetbrains.kotlin:kotlin-serialization from 1.8.21 to 1.9.21 (#…

…559)

Bumps [org.jetbrains.kotlin:kotlin-serialization](https://github.com/JetBrains/kotlin) from 1.8.21 to 1.9.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.8.21...v1.9.21)

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

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>
Co-authored-by: Ian Clarke <sanity@users.noreply.github.com>

buildSrc/build.gradle.kts

@@ -17,7 +17,7 @@ dependencies {
  // Use their Maven coordinates (plus versions), not Gradle plugin IDs!
  // This should be the only place that Gradle plugin versions are defined, so they are aligned across all build scripts
  implementation("org.jetbrains.kotlin:kotlin-gradle-plugin:1.8.21")
- implementation("org.jetbrains.kotlin:kotlin-serialization:1.8.21")
+ implementation("org.jetbrains.kotlin:kotlin-serialization:1.9.21")
 }
 
 val gradleJvmTarget = 11