Bump plugin from 4.16 to 4.18

Bumps [plugin](https://github.com/jenkinsci/plugin-pom) from 4.16 to 4.18.
- [Release notes](https://github.com/jenkinsci/plugin-pom/releases)
- [Changelog](https://github.com/jenkinsci/plugin-pom/blob/master/CHANGELOG.md)
- [Commits](jenkinsci/plugin-pom@plugin-4.16...plugin-4.18)

Signed-off-by: dependabot[bot] <[email protected]>

Author: dependabot[bot]

pom.xml

@@ -3,7 +3,7 @@
   <parent>
     <groupId>org.jenkins-ci.plugins</groupId>
     <artifactId>plugin</artifactId>
-    <version>4.16</version>
+    <version>4.18</version>
     <relativePath />
   </parent>