SONAR-13155 add a comment about lib diffutils

build.gradle

@@ -184,6 +184,9 @@ subprojects {
         entry 'scribejava-apis'
         entry 'scribejava-core'
       }
+      // This project is no longer maintained and was forked
+      // by https://github.com/java-diff-utils/java-diff-utils
+      // (io.github.java-diff-utils:java-diff-utils).
       dependency 'com.googlecode.java-diff-utils:diffutils:1.2'
       dependency('com.googlecode.json-simple:json-simple:1.1.1') {
         exclude 'junit:junit'