Bump com.diffplug.spotless from 6.7.2 to 6.8.0

Bumps com.diffplug.spotless from 6.7.2 to 6.8.0.

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

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

build.gradle.kts

@@ -13,7 +13,7 @@ plugins {
     // // OpenAPI code generation
     // id("org.openapi.generator") version "4.3.1"
     // Code formatting
-    id("com.diffplug.spotless") version "6.7.2"
+    id("com.diffplug.spotless") version "6.8.0"
 }
 
 val version: String by project