Bump org.codehaus.groovy:groovy-all from 2.4.7 to 2.4.21 (#360)

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:development
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

pom.xml

@@ -70,7 +70,7 @@
              JNR has broken compatibility between minor versions in the past. -->
         <jnr-ffi.version>2.2.16</jnr-ffi.version>
         <jnr-posix.version>3.1.15</jnr-posix.version>
-        <groovy.version>2.4.7</groovy.version>
+        <groovy.version>2.4.21</groovy.version>
         <jax-rs.version>2.0.1</jax-rs.version>
         <jersey.version>2.23.1</jersey.version>
         <hk2.version>2.4.0-b34</hk2.version>