Bump kotlinVersion from 2.2.21 to 2.3.0

Bumps `kotlinVersion` from 2.2.21 to 2.3.0.

Updates `jvm` from 2.2.21 to 2.3.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.2.21...v2.3.0)

Updates `plugin.spring` from 2.2.21 to 2.3.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.2.21...v2.3.0)

---
updated-dependencies:
- dependency-name: jvm
  dependency-version: 2.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: plugin.spring
  dependency-version: 2.3.0
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

Author: dependabot[bot]

build.gradle.kts

@@ -5,7 +5,7 @@ import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
 plugins {
     id("org.springframework.boot") version "4.0.0"
     id("io.spring.dependency-management") version "1.1.7"
-    val kotlinVersion = "2.2.21"
+    val kotlinVersion = "2.3.0"
     kotlin("jvm") version kotlinVersion
     kotlin("plugin.spring") version kotlinVersion
     id("org.openapi.generator") version "7.17.0"