Bump maven-hpi-plugin from 3.19 to 3.20 (#452)

Bumps [maven-hpi-plugin](https://github.com/jenkinsci/maven-hpi-plugin) from 3.19 to 3.20.
- [Release notes](https://github.com/jenkinsci/maven-hpi-plugin/releases)
- [Commits](jenkinsci/maven-hpi-plugin@maven-hpi-plugin-3.19...maven-hpi-plugin-3.20)

---
updated-dependencies:
- dependency-name: org.jenkins-ci.tools:maven-hpi-plugin
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

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

pom.xml

@@ -55,7 +55,7 @@
 
     <jenkins-test-harness.version>1645.vf98fc478f846</jenkins-test-harness.version>
 
-    <hpi-plugin.version>3.19</hpi-plugin.version>
+    <hpi-plugin.version>3.20</hpi-plugin.version>
     <stapler-plugin.version>1.17</stapler-plugin.version>
     <java.level>you-must-override-the-java.level-property</java.level>
     <!-- Change this property if you need your tests to be compiled with a different Java level than the plugin. -->