Bump com.diffplug.spotless in /services/hanke-service

Bumps com.diffplug.spotless from 7.2.1 to 8.0.0.

---
updated-dependencies:
- dependency-name: com.diffplug.spotless
  dependency-version: 8.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

services/hanke-service/build.gradle.kts

@@ -57,7 +57,7 @@ plugins {
     val kotlinVersion = "2.1.21"
     id("org.springframework.boot") version "3.5.5"
     id("io.spring.dependency-management") version "1.1.7"
-    id("com.diffplug.spotless") version "7.2.1"
+    id("com.diffplug.spotless") version "8.0.0"
     kotlin("jvm") version kotlinVersion
     // Gives kotlin-allopen, which auto-opens classes with certain annotations
     kotlin("plugin.spring") version kotlinVersion