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] <support@github.com>

pom.xml

@@ -4,7 +4,7 @@
     <parent>
         <groupId>org.jenkins-ci.plugins</groupId>
         <artifactId>plugin</artifactId>
-        <version>4.16</version>
+        <version>4.18</version>
         <relativePath />
     </parent>
     <artifactId>command-launcher</artifactId>