Bump org.jenkins-ci.plugins:p4 from 1.13.3 to 1.15.1

Bumps [org.jenkins-ci.plugins:p4](https://github.com/jenkinsci/p4-plugin) from 1.13.3 to 1.15.1.
- [Changelog](https://github.com/jenkinsci/p4-plugin/blob/master/RELEASE.md)
- [Commits](jenkinsci/p4-plugin@p4-1.13.3...p4-1.15.1)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.plugins:p4
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

pom.xml

@@ -275,7 +275,7 @@
     <dependency>
       <groupId>org.jenkins-ci.plugins</groupId>
       <artifactId>p4</artifactId>
-      <version>1.13.3</version>
+      <version>1.15.1</version>
       <optional>true</optional>
       <exclusions>
         <exclusion>