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

Bumps [org.apache.groovy:groovy-bom](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-bom
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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

Author: dependabot[bot]

gradle/libs.versions.toml

@@ -32,7 +32,7 @@ kotest-runner = { module = "io.kotest:kotest-runner-junit5" }
 kotest-datatest = { module = "io.kotest:kotest-framework-datatest" }
 mockk = "io.mockk:mockk:1.13.10"
 
-groovy-bom = "org.apache.groovy:groovy-bom:4.0.20"
+groovy-bom = "org.apache.groovy:groovy-bom:4.0.21"
 spock = "org.spockframework:spock-core:2.3-groovy-4.0"
 
 plugin-kotlin = { module = "org.jetbrains.kotlin:kotlin-gradle-plugin", version.ref = "kotlin" }