Bump plugin-util-api from 1.6.0 to 1.6.1

Bumps [plugin-util-api](https://github.com/jenkinsci/plugin-util-api-plugin) from 1.6.0 to 1.6.1.
- [Release notes](https://github.com/jenkinsci/plugin-util-api-plugin/releases)
- [Changelog](https://github.com/jenkinsci/plugin-util-api-plugin/blob/master/CHANGELOG.md)
- [Commits](jenkinsci/plugin-util-api-plugin@v1.6.0...v1.6.1)

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

pom.xml

@@ -23,7 +23,7 @@
     <changelist>-SNAPSHOT</changelist>
 
     <!-- Jenkins Plug-in Dependencies Versions -->
-    <plugin-util-api.version>1.6.0</plugin-util-api.version>
+    <plugin-util-api.version>1.6.1</plugin-util-api.version>
     <pipeline-stage-step.version>2.5</pipeline-stage-step.version>
   </properties>