chore(deps): bump kotlin.version from 2.1.10 to 2.1.20 in /kotlin

Bumps `kotlin.version` from 2.1.10 to 2.1.20.

Updates `org.jetbrains.kotlin:kotlin-maven-allopen` from 2.1.10 to 2.1.20

Updates `org.jetbrains.kotlin:kotlin-maven-plugin` from 2.1.10 to 2.1.20

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-maven-allopen
  dependency-version: 2.1.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: org.jetbrains.kotlin:kotlin-maven-plugin
  dependency-version: 2.1.20
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

kotlin/pom.xml

@@ -23,7 +23,7 @@
 		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
 		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
 		<maven.compiler.release>21</maven.compiler.release>
-		<kotlin.version>2.1.10</kotlin.version>
+		<kotlin.version>2.1.20</kotlin.version>
 		<maven-surefire-plugin.version>3.5.2</maven-surefire-plugin.version>
 	</properties>