Bump jvm from 1.9.20 to 1.9.21

Bumps [jvm](https://github.com/JetBrains/kotlin) from 1.9.20 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@v1.9.20...v1.9.21)

---
updated-dependencies:
- dependency-name: jvm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

build.gradle.kts

@@ -3,7 +3,7 @@ import java.text.SimpleDateFormat
 import java.util.*
 
 plugins {
-  kotlin("jvm") version "1.9.20"
+  kotlin("jvm") version "1.9.21"
   id("maven-publish")
   id("signing")
   id("com.github.ben-manes.versions") version "0.50.0"