Bump groovy-xml from 3.0.11 to 3.0.12 (#236)

Bumps [groovy-xml](https://github.com/apache/groovy) from 3.0.11 to 3.0.12.
- [Release notes](https://github.com/apache/groovy/releases)
- [Commits](https://github.com/apache/groovy/commits)

---
updated-dependencies:
- dependency-name: org.codehaus.groovy:groovy-xml
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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plexus-compiler-its/pom.xml

@@ -81,7 +81,7 @@
           <dependency>
             <groupId>org.codehaus.groovy</groupId>
             <artifactId>groovy-xml</artifactId>
-            <version>3.0.11</version>
+            <version>3.0.12</version>
           </dependency>
         </dependencies>
       </plugin>