chore(deps): update plugin org.sonarqube to v6

Author: renovate[bot]

build.gradle

@@ -3,7 +3,7 @@ plugins {
   id 'java'
   id 'checkstyle'
   id 'com.github.spotbugs' version '6.1.13'
-  id 'org.sonarqube' version '4.0.0.2929'
+  id 'org.sonarqube' version '6.3.1.5724'
   id 'maven-publish'
   id 'org.embulk.embulk-plugins' version '0.7.0'
   id 'org.jreleaser' version '1.20.0'