Bump org.jetbrains.kotlin.jvm from 1.9.20 to 1.9.21

Bumps [org.jetbrains.kotlin.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: org.jetbrains.kotlin.jvm
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -9,7 +9,7 @@ plugins {
   id("net.ossindex.audit") version "0.4.11"
   id("io.freefair.maven-central.validate-poms") version "8.4"
   id("io.github.gradle-nexus.publish-plugin") version "1.3.0"
-  id("org.jetbrains.kotlin.jvm") version "1.9.20" apply false
+  id("org.jetbrains.kotlin.jvm") version "1.9.21" apply false
   id("com.google.devtools.ksp") version "1.9.21-1.0.15" apply false
   id("org.openapi.generator") version "7.1.0" apply false
   id("org.jlleitschuh.gradle.ktlint") version "11.6.1" apply false