Remove useless dependency

Author: blacelle

lib/build.gradle

@@ -61,7 +61,6 @@ dependencies {
 	testCommonImplementation "org.junit.jupiter:junit-jupiter:$VER_JUNIT"
 	testCommonImplementation "org.assertj:assertj-core:$VER_ASSERTJ"
 	testCommonImplementation "com.diffplug.durian:durian-testlib:$VER_DURIAN"
-	testCommonImplementation 'io.github.solven-eu.cleanthat:java:2.1'
 
 	// used for pom sorting
 	sortPomCompileOnly 'com.github.ekryd.sortpom:sortpom-sorter:3.0.0'