Bump org.jetbrains.kotlin.jvm from 1.6.21 to 1.8.20

Bumps [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) from 1.6.21 to 1.8.20.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v1.8.20/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.6.21...v1.8.20)

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

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

Author: dependabot[bot]

build.gradle

@@ -6,7 +6,7 @@
 
 plugins {
     // Apply the Kotlin JVM plugin to add support for Kotlin.
-    id 'org.jetbrains.kotlin.jvm' version '1.6.21'
+    id 'org.jetbrains.kotlin.jvm' version '1.8.20'
 
     // Apply the application plugin to add support for building a CLI application.
     id 'application'