Bump org.apache.groovy:groovy from 4.0.20 to 4.0.21

Bumps [org.apache.groovy:groovy](https://github.com/apache/groovy) from 4.0.20 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
...

Signed-off-by: dependabot[bot] <[email protected]>

build.gradle

@@ -71,7 +71,7 @@ subprojects {
 
         // Spock
         testImplementation(platform("org.spockframework:spock-bom:2.4-M4-groovy-4.0"))
-        testImplementation("org.apache.groovy:groovy:4.0.20")
+        testImplementation("org.apache.groovy:groovy:4.0.21")
         testImplementation("org.spockframework:spock-core")
         testImplementation("org.spockframework:spock-spring")
         testRuntimeOnly("net.bytebuddy:byte-buddy:1.14.13")