build(deps): bump gmavenplus-plugin from 2.1.0 to 3.0.0

Bumps [gmavenplus-plugin](https://github.com/groovy/GMavenPlus) from 2.1.0 to 3.0.0.
- [Release notes](https://github.com/groovy/GMavenPlus/releases)
- [Commits](https://github.com/groovy/GMavenPlus/compare/2.1.0...3.0.0)

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

Signed-off-by: dependabot[bot] <support@github.com>
diff --git a/pom.xml b/pom.xml
index 25a8bbc..d90ab1e 100644
--- a/pom.xml
+++ b/pom.xml
@@ -56,7 +56,7 @@
         <hamcrest-version>2.2</hamcrest-version>
 
         <!-- plugins -->
-        <gmavenplus-plugin-version>2.1.0</gmavenplus-plugin-version>
+        <gmavenplus-plugin-version>3.0.0</gmavenplus-plugin-version>
         <maven-compiler-plugin-version>3.11.0</maven-compiler-plugin-version>
         <maven-assembly-plugin-version>3.5.0</maven-assembly-plugin-version>
         <maven-dependency-plugin-version>3.5.0</maven-dependency-plugin-version>