chore(deps): bump plugin.serialization from 2.2.0 to 2.2.21

Bumps [plugin.serialization](https://github.com/JetBrains/kotlin) from 2.2.0 to 2.2.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.2.0...v2.2.21)

---
updated-dependencies:
- dependency-name: plugin.serialization
  dependency-version: 2.2.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -29,7 +29,7 @@ plugins {
     id("com.google.cloud.tools.jib") version "3.4.5"
     id("com.vanniktech.maven.publish") version "0.34.0"
     id("org.jetbrains.dokka") version "2.0.0"
-    kotlin("plugin.serialization") version "2.2.0"
+    kotlin("plugin.serialization") version "2.2.21"
     `java-library`
     signing
 }