[deps]: Bump org.jetbrains.kotlin.plugin.spring from 1.9.25 to 2.0.21

Bumps [org.jetbrains.kotlin.plugin.spring](https://github.com/JetBrains/kotlin) from 1.9.25 to 2.0.21.
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/master/ChangeLog.md)
- [Commits](JetBrains/kotlin@v1.9.25...v2.0.21)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin.plugin.spring
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -3,7 +3,7 @@ import com.github.davidmc24.gradle.plugin.avro.GenerateAvroJavaTask
 plugins {
     id "idea"
     id "org.jetbrains.kotlin.jvm" version "1.9.25"
-    id "org.jetbrains.kotlin.plugin.spring" version "1.9.25"
+    id "org.jetbrains.kotlin.plugin.spring" version "2.0.21"
     id "org.springframework.boot" version "3.3.6"
     id "io.spring.dependency-management" version "1.1.6"
     id "com.github.davidmc24.gradle.plugin.avro-base" version "1.9.1"