Bump org.jenkins-ci.plugins:plugin from 5.17 to 5.18 (#531)

Author: dependabot[bot]

pom.xml

@@ -29,7 +29,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>5.17</version>
+    <version>5.18</version>
     <relativePath/>
   </parent>