Bump org.jetbrains.kotlin.jvm from 2.1.20 to 2.1.21

Bumps [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) from 2.1.20 to 2.1.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.1.20...v2.1.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-version: 2.1.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle

@@ -3,7 +3,7 @@ buildscript {
 }
 
 plugins {
-	id 'org.jetbrains.kotlin.jvm' version "2.1.20" apply false
+	id 'org.jetbrains.kotlin.jvm' version "2.1.21" apply false
 	id 'org.jetbrains.dokka' version "2.0.0" apply false
 	id 'org.beryx.jar' version "2.0.0" apply false
 }