Bump the build-dependencies group with 3 updates

Bumps the build-dependencies group with 3 updates: [org.junit:junit-bom](https://github.com/junit-team/junit-framework), [com.lesfurets:jenkins-pipeline-unit](https://github.com/jenkinsci/JenkinsPipelineUnit) and [org.codehaus.gmavenplus:gmavenplus-plugin](https://github.com/groovy/GMavenPlus).


Updates `org.junit:junit-bom` from 5.13.2 to 5.13.4
- [Release notes](https://github.com/junit-team/junit-framework/releases)
- [Commits](junit-team/junit-framework@r5.13.2...r5.13.4)

Updates `com.lesfurets:jenkins-pipeline-unit` from 1.26 to 1.27
- [Release notes](https://github.com/jenkinsci/JenkinsPipelineUnit/releases)
- [Changelog](https://github.com/jenkinsci/JenkinsPipelineUnit/blob/master/RELEASE.md)
- [Commits](jenkinsci/JenkinsPipelineUnit@v1.26...v1.27)

Updates `org.codehaus.gmavenplus:gmavenplus-plugin` from 4.2.0 to 4.2.1
- [Release notes](https://github.com/groovy/GMavenPlus/releases)
- [Commits](groovy/GMavenPlus@4.2.0...4.2.1)

---
updated-dependencies:
- dependency-name: org.junit:junit-bom
  dependency-version: 5.13.4
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: build-dependencies
- dependency-name: com.lesfurets:jenkins-pipeline-unit
  dependency-version: '1.27'
  dependency-type: direct:development
  update-type: version-update:semver-minor
  dependency-group: build-dependencies
- dependency-name: org.codehaus.gmavenplus:gmavenplus-plugin
  dependency-version: 4.2.1
  dependency-type: direct:production
  update-type: version-update:semver-patch
  dependency-group: build-dependencies
...

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

Author: dependabot[bot]

pom.xml

@@ -59,7 +59,7 @@
             <dependency>
                 <groupId>org.junit</groupId>
                 <artifactId>junit-bom</artifactId>
-                <version>5.13.2</version>
+                <version>5.13.4</version>
                 <type>pom</type>
                 <scope>import</scope>
             </dependency>
@@ -98,7 +98,7 @@
         <dependency>
             <groupId>com.lesfurets</groupId>
             <artifactId>jenkins-pipeline-unit</artifactId>
-            <version>1.26</version>
+            <version>1.27</version>
             <scope>test</scope>
         </dependency>
         <dependency>
@@ -164,7 +164,7 @@
             <plugin>
                 <groupId>org.codehaus.gmavenplus</groupId>
                 <artifactId>gmavenplus-plugin</artifactId>
-                <version>4.2.0</version>
+                <version>4.2.1</version>
                 <configuration>
                     <sources>
                         <source>