Bump kotlinVersion from 2.0.20 to 2.0.21

Bumps `kotlinVersion` from 2.0.20 to 2.0.21.

Updates `org.jetbrains.kotlin.plugin.allopen` from 2.0.20 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

Updates `jvm` from 2.0.20 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

Updates `plugin.spring` from 2.0.20 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.0.21/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.20...v2.0.21)

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

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle.kts

@@ -5,7 +5,7 @@ plugins {
     id("io.spring.dependency-management") version "1.1.6"
     id("org.jmailen.kotlinter") version "4.3.0"
     id("io.gitlab.arturbosch.detekt") version "1.23.7"
-    val kotlinVersion = "2.0.20"
+    val kotlinVersion = "2.0.21"
     id("org.jetbrains.kotlin.plugin.allopen") version kotlinVersion
     kotlin("jvm") version kotlinVersion
     kotlin("plugin.spring") version kotlinVersion