Bump org.apache.groovy:groovy from 4.0.18 to 4.0.21 (#80)

Bumps [org.apache.groovy:groovy](https://github.com/apache/groovy) from 4.0.18 to 4.0.21.
- [Commits](https://github.com/apache/groovy/commits)

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

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Author: dependabot[bot]

build.gradle.kts

@@ -24,7 +24,7 @@ dependencies {
 
     testImplementation("org.junit.jupiter:junit-jupiter-api:5.10.2")
     testImplementation("org.junit.vintage:junit-vintage-engine:5.10.1")
-    testImplementation("org.apache.groovy:groovy:4.0.18")
+    testImplementation("org.apache.groovy:groovy:4.0.21")
     testImplementation("org.spockframework:spock-core:2.3-groovy-4.0")
     testImplementation("com.github.tomakehurst:wiremock-jre8:3.0.1")
     testImplementation("net.bytebuddy:byte-buddy:1.14.14")