Bump bom-2.235.x from 13 to 18 (#35)

Bumps [bom-2.235.x](https://github.com/jenkinsci/pom) from 13 to 18.
- [Release notes](https://github.com/jenkinsci/pom/releases)
- [Changelog](https://github.com/jenkinsci/pom/blob/master/CHANGELOG.md)
- [Commits](https://github.com/jenkinsci/pom/commits)

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

Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -27,7 +27,7 @@
             <dependency>
                 <groupId>io.jenkins.tools.bom</groupId>
                 <artifactId>bom-2.235.x</artifactId>
-                <version>16</version>
+                <version>18</version>
                 <scope>import</scope>
                 <type>pom</type>
             </dependency>