Bump gmavenplus-plugin from 1.12.0 to 1.13.1

Bumps [gmavenplus-plugin](https://github.com/groovy/GMavenPlus) from 1.12.0 to 1.13.1.
- [Release notes](https://github.com/groovy/GMavenPlus/releases)
- [Commits](https://github.com/groovy/GMavenPlus/compare/1.12.0...1.13.1)

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

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

pom.xml

@@ -22,7 +22,7 @@
         visit https://github.com/groovy/GMavenPlus/wiki -->
         <groupId>org.codehaus.gmavenplus</groupId>
         <artifactId>gmavenplus-plugin</artifactId>
-        <version>1.12.0</version>
+        <version>1.13.1</version>
         <executions>
           <execution>
             <goals>