Bump com.diffplug.spotless from 6.5.2 to 6.6.1 (#139)

build.gradle

@@ -6,7 +6,7 @@ plugins {
 	id 'maven-publish' // publish to a maven repo (local or mvn central, has to be defined)
 	id 'pmd' // code check, working on source code
 	id 'com.github.spotbugs' version '5.0.6' // code check, working on byte code
-	id 'com.diffplug.spotless' version '6.5.2'// code format
+	id 'com.diffplug.spotless' version '6.6.1'// code format
 	id 'com.simonharrer.modernizer' version '2.1.0-1' // detect deprecated APIs
 	id 'com.github.onslip.gradle-one-jar' version '1.0.6' // pack a self contained jar
 	id 'jacoco' // java code coverage plugin