chore(deps): 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] <support@github.com>

build.gradle.kts

@@ -18,7 +18,7 @@ version = appVersion
 
 plugins {
     application
-    kotlin("jvm") version "1.9.20"
+    kotlin("jvm") version "1.9.21"
     id("io.ktor.plugin") version "2.3.6"
     id("org.jetbrains.kotlin.plugin.serialization") version "1.9.20"
     id("io.gitlab.arturbosch.detekt") version "1.23.3"