Bump org.jetbrains.kotlin.jvm from 1.6.20 to 1.6.21

Bumps org.jetbrains.kotlin.jvm from 1.6.20 to 1.6.21.

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

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

Author: dependabot[bot]

build.gradle.kts

@@ -8,7 +8,7 @@ plugins {
     // Java support
     id("java")
     // Kotlin support
-    id("org.jetbrains.kotlin.jvm") version "1.6.20"
+    id("org.jetbrains.kotlin.jvm") version "1.6.21"
     // gradle-intellij-plugin - read more: https://github.com/JetBrains/gradle-intellij-plugin
     id("org.jetbrains.intellij") version "1.5.3"
     // gradle-changelog-plugin - read more: https://github.com/JetBrains/gradle-changelog-plugin