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] <[email protected]>

settings.gradle.kts

@@ -1,7 +1,7 @@
 rootProject.name = "pensjon-etterlatte-felles"
 
 plugins {
-    kotlin("jvm") version "1.9.20" apply false
+    kotlin("jvm") version "1.9.21" apply false
 }
 
 include(