Bump kotlin.version from 1.9.24 to 2.0.21

Bumps `kotlin.version` from 1.9.24 to 2.0.21.

Updates `org.jetbrains.kotlin:kotlin-stdlib` from 1.9.24 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.9.24...v2.0.21)

Updates `org.jetbrains.kotlin:kotlin-stdlib-jdk8` from 1.9.24 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.9.24...v2.0.21)

Updates `org.jetbrains.kotlin:kotlin-reflect` from 1.9.24 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.9.24...v2.0.21)

Updates `org.jetbrains.kotlin:kotlin-test-junit` from 1.9.24 to 2.0.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](https://github.com/JetBrains/kotlin/compare/v1.9.24...v2.0.21)

Updates `org.jetbrains.kotlin:kotlin-maven-plugin` from 1.9.24 to 2.0.21

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib-jdk8
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.jetbrains.kotlin:kotlin-reflect
  dependency-type: direct:development
  update-type: version-update:semver-major
- dependency-name: org.jetbrains.kotlin:kotlin-test-junit
  dependency-type: direct:production
  update-type: version-update:semver-major
- dependency-name: org.jetbrains.kotlin:kotlin-maven-plugin
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

pom.xml

@@ -92,7 +92,7 @@
 
 
         <kotlin.compiler.jvmTarget>${maven.compiler.test.target}</kotlin.compiler.jvmTarget>
-        <kotlin.version>1.9.24</kotlin.version>
+        <kotlin.version>2.0.21</kotlin.version>
         <kotest.version>5.9.1</kotest.version>
         <junit5.version>5.11.2</junit5.version>
         <dokka.version>1.9.20</dokka.version>