Bump org.codehaus.groovy:groovy from 3.0.20 to 3.0.21

Bumps [org.codehaus.groovy:groovy](https://github.com/apache/groovy) from 3.0.20 to 3.0.21.
- [Commits](https://github.com/apache/groovy/commits)

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

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

build.gradle

@@ -106,8 +106,8 @@ dependencies {
     implementation 'com.google.guava:guava:' + guavaVersion
     testImplementation group: 'junit', name: 'junit', version: '4.13.2'
     testImplementation 'org.spockframework:spock-core:2.0-groovy-3.0'
-    testImplementation 'org.codehaus.groovy:groovy:3.0.20'
-    testImplementation 'org.codehaus.groovy:groovy-json:3.0.20'
+    testImplementation 'org.codehaus.groovy:groovy:3.0.21'
+    testImplementation 'org.codehaus.groovy:groovy-json:3.0.21'
     testImplementation 'com.google.code.gson:gson:2.10.1'
     testImplementation 'org.eclipse.jetty:jetty-server:11.0.20'
     testImplementation 'com.fasterxml.jackson.core:jackson-databind:2.16.1'