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

@@ -44,7 +44,7 @@ dependencies {
     implementation "com.graphql-java:graphql-java:21.3"
 
     testImplementation "org.spockframework:spock-core:2.3-groovy-3.0"
-    testImplementation "org.codehaus.groovy:groovy:3.0.20"
+    testImplementation "org.codehaus.groovy:groovy:3.0.21"
 }
 
 task sourcesJar(type: Jar, dependsOn: classes) {