Bump org.codehaus.gmavenplus:gmavenplus-plugin from 3.0.2 to 4.2.1

Bumps [org.codehaus.gmavenplus:gmavenplus-plugin](https://github.com/groovy/GMavenPlus) from 3.0.2 to 4.2.1.
- [Release notes](https://github.com/groovy/GMavenPlus/releases)
- [Commits](groovy/GMavenPlus@3.0.2...4.2.1)

---
updated-dependencies:
- dependency-name: org.codehaus.gmavenplus:gmavenplus-plugin
  dependency-version: 4.2.1
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

ocpp-v1_6-test/pom.xml

@@ -99,7 +99,7 @@
             <plugin>
                 <groupId>org.codehaus.gmavenplus</groupId>
                 <artifactId>gmavenplus-plugin</artifactId>
-                <version>3.0.2</version>
+                <version>4.2.1</version>
                 <executions>
                     <execution>
                         <goals>

ocpp-v2-test/pom.xml

@@ -125,7 +125,7 @@
             <plugin>
                 <groupId>org.codehaus.gmavenplus</groupId>
                 <artifactId>gmavenplus-plugin</artifactId>
-                <version>3.0.2</version>
+                <version>4.2.1</version>
                 <executions>
                     <execution>
                         <goals>

ocpp-v2_0-test/pom.xml

@@ -100,7 +100,7 @@
             <plugin>
                 <groupId>org.codehaus.gmavenplus</groupId>
                 <artifactId>gmavenplus-plugin</artifactId>
-                <version>3.0.2</version>
+                <version>4.2.1</version>
                 <executions>
                     <execution>
                         <goals>