Bump org.codehaus.groovy:groovy-all from 2.4.7 to 2.4.21

Bumps [org.codehaus.groovy:groovy-all](https://github.com/apache/groovy) from 2.4.7 to 2.4.21.
- [Commits](https://github.com/apache/groovy/commits)

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

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

pom.xml

@@ -60,7 +60,7 @@
         <log4j-slf4j-impl.version>2.13.0</log4j-slf4j-impl.version>
         <validation-api.version>2.0.1.Final</validation-api.version>
         <commons-logging.version>1.2</commons-logging.version>
-        <groovy.version>2.4.7</groovy.version>
+        <groovy.version>2.4.21</groovy.version>
         <slf4j-api.version>1.7.25</slf4j-api.version>
         <hamcrest.version>2.2</hamcrest.version>
         <httpasyncclient.version>5.1.3</httpasyncclient.version>