chore(deps): bump org.jetbrains.kotlin.jvm from 1.9.10 to 1.9.21

Bumps [org.jetbrains.kotlin.jvm](https://github.com/JetBrains/kotlin) from 1.9.10 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@v1.9.10...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]>

build.gradle

@@ -9,7 +9,7 @@ buildscript {
     ext.guavaVersion = '32.1.1-jre'
     ext.junitVersion = '5.10.0'
     ext.kotestVersion = '5.6.2'
-    ext.kotlinVersion = "1.9.10"
+    ext.kotlinVersion = "1.9.21"
     ext.mockkVersion = "1.13.7"
 
     repositories {