FINERACT-2181: Update plugin com.diffplug.spotless to v8

Author: renovate-bot

build.gradle

@@ -99,7 +99,7 @@ plugins {
     id 'me.qoomon.git-versioning' version '6.4.4'
     id "org.barfuin.gradle.taskinfo" version "2.2.0"
     id 'com.adarshr.test-logger' version '4.0.0'
-    id 'com.diffplug.spotless' version '6.25.0' apply false
+    id 'com.diffplug.spotless' version '8.1.0' apply false
     id 'org.nosphere.apache.rat' version '0.8.1' apply false
     id 'com.github.hierynomus.license' version '0.16.1' apply false
     id 'com.github.jk1.dependency-license-report' version '2.9' apply false