Bump org.codehaus.groovy:groovy from 2.4.16 to 2.4.21

Bumps [org.codehaus.groovy:groovy](https://github.com/apache/groovy) from 2.4.16 to 2.4.21.
- [Commits](https://github.com/apache/groovy/commits)

---
updated-dependencies:
- dependency-name: org.codehaus.groovy:groovy
  dependency-type: direct:production
...

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

pom.xml

@@ -105,7 +105,7 @@
         <version.lib.maven.plugin.api>3.9.3</version.lib.maven.plugin.api>
         <version.lib.maven.plugin.project>2.2.1</version.lib.maven.plugin.project>
         <version.lib.apiguardian.api>1.1.2</version.lib.apiguardian.api>
-        <version.lib.groovy>2.4.16</version.lib.groovy>
+        <version.lib.groovy>2.4.21</version.lib.groovy>
         <!--
         !Version statement! - end
         -->