Bump the jenkins group with 2 updates

Bumps the jenkins group with 2 updates: [org.jenkins-ci.plugins:plugin](https://github.com/jenkinsci/plugin-pom) and [io.jenkins.tools.bom:bom-2.479.x](https://github.com/jenkinsci/bom).


Updates `org.jenkins-ci.plugins:plugin` from 5.5 to 5.6
- [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-5.5...plugin-5.6)

Updates `io.jenkins.tools.bom:bom-2.479.x` from 3893.v213a_42768d35 to 4051.v78dce3ce8b_d6
- [Release notes](https://github.com/jenkinsci/bom/releases)
- [Commits](https://github.com/jenkinsci/bom/commits)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.plugins:plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
  dependency-group: jenkins
- dependency-name: io.jenkins.tools.bom:bom-2.479.x
  dependency-type: direct:production
  dependency-group: jenkins
...

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>5.5</version>
+    <version>5.6</version>
     <relativePath />
   </parent>
 
@@ -63,7 +63,7 @@
       <dependency>
         <groupId>io.jenkins.tools.bom</groupId>
         <artifactId>bom-${jenkins.baseline}.x</artifactId>
-        <version>3893.v213a_42768d35</version>
+        <version>4051.v78dce3ce8b_d6</version>
         <type>pom</type>
         <scope>import</scope>
       </dependency>