[ci] Configure property sonar.organization

The "sonar.organization" property is not yet, but
will become mandatory.
Take the opportunity and change it to the new organisation "pmd"
now: https://sonarcloud.io/organizations/pmd

pom.xml

@@ -948,6 +948,7 @@ Objective-C, Perl, PHP, PLSQL, Python, Ruby, Salesforce.com Apex, Scala, Swift a
             <id>sonar</id>
             <properties>
                 <sonar.host.url>https://sonarcloud.io</sonar.host.url>
+                <sonar.organization>pmd</sonar.organization>
             </properties>
             <build>
                 <pluginManagement>