Update dependency org.jenkins-ci.plugins:sonar to v2.18

Author: renovate[bot]

integrations/pom.xml

@@ -303,7 +303,7 @@
     <dependency>
       <groupId>org.jenkins-ci.plugins</groupId>
       <artifactId>sonar</artifactId>
-      <version>2.17.2</version>
+      <version>2.18</version>
       <scope>test</scope>
     </dependency>
     <dependency>