Bump kotlin from 2.0.0 to 2.1.0 in /service

Bumps `kotlin` from 2.0.0 to 2.1.0.

Updates `org.jetbrains.kotlin:kotlin-bom` from 2.0.0 to 2.1.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.1.0/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.0...v2.1.0)

Updates `org.jetbrains.kotlin.plugin.allopen` from 2.0.0 to 2.1.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.1.0/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.0...v2.1.0)

Updates `org.jetbrains.kotlin.jvm` from 2.0.0 to 2.1.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.1.0/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.0...v2.1.0)

Updates `org.jetbrains.kotlin.plugin.spring` from 2.0.0 to 2.1.0
- [Release notes](https://github.com/JetBrains/kotlin/releases)
- [Changelog](https://github.com/JetBrains/kotlin/blob/v2.1.0/ChangeLog.md)
- [Commits](JetBrains/kotlin@v2.0.0...v2.1.0)

---
updated-dependencies:
- dependency-name: org.jetbrains.kotlin:kotlin-bom
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin.plugin.allopen
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin.jvm
  dependency-type: direct:production
  update-type: version-update:semver-minor
- dependency-name: org.jetbrains.kotlin.plugin.spring
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

service/gradle/libs.versions.toml

@@ -9,7 +9,7 @@ flyingsaucer = "9.4.0"
 flyway = "11.0.0"
 fuel = "2.3.1"
 java = "21"
-kotlin = "2.0.0"
+kotlin = "2.1.0"
 ktfmt = "0.21.0"
 ktlint = "1.4.0"
 ktlint-gradle = "12.1.0"