Bump kotlin.version from 2.2.20 to 2.2.21 (#1228)

Bumps `kotlin.version` from 2.2.20 to 2.2.21.

Updates `org.jetbrains.kotlin:kotlin-stdlib` from 2.2.20 to 2.2.21
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.2.20...v2.2.21)

Updates `org.jetbrains.kotlin:kotlin-maven-plugin` from 2.2.20 to 2.2.21

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-stdlib
  dependency-version: 2.2.21
  dependency-type: direct:development
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-maven-plugin
  dependency-version: 2.2.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -46,7 +46,7 @@
 		<javac.target>1.8</javac.target>
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<junit.version>5.13.4</junit.version>
-		<kotlin.version>2.2.20</kotlin.version>
+		<kotlin.version>2.2.21</kotlin.version>
 		<kotlin.compiler.incremental>true</kotlin.compiler.incremental>
 	</properties>