Bump kotlinVersion from 2.2.20 to 2.2.21 in /services/hanke-service

Bumps `kotlinVersion` from 2.2.20 to 2.2.21.

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

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

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

---
updated-dependencies:
- dependency-name: jvm
  dependency-version: 2.2.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: plugin.spring
  dependency-version: 2.2.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
- dependency-name: plugin.jpa
  dependency-version: 2.2.21
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

services/hanke-service/build.gradle.kts

@@ -56,7 +56,7 @@ spotless {
 }
 
 plugins {
-    val kotlinVersion = "2.2.20"
+    val kotlinVersion = "2.3.20"
     id("org.springframework.boot") version "3.5.11"
     id("io.spring.dependency-management") version "1.1.7"
     id("com.diffplug.spotless") version "7.2.1"