chore(deps): bump jvm from 1.8.10 to 1.9.21

Bumps [jvm](https://github.com/JetBrains/kotlin) from 1.8.10 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@v1.8.10...v1.9.21)

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

Signed-off-by: dependabot[bot] <support@github.com>

build.gradle.kts

@@ -2,7 +2,7 @@ import net.researchgate.release.ReleasePlugin
 
 plugins {
     base
-    kotlin("jvm") version "1.8.10"
+    kotlin("jvm") version "1.9.21"
     id("org.jetbrains.dokka") version "1.7.10" apply false
     id("com.ekino.oss.plugin.kotlin-quality") version "4.2.0" apply false
     id("net.researchgate.release") version "3.0.2"