fix(deps): update groovy monorepo to v3.0.20 (#700)

Co-authored-by: renovate[bot] <29139614+renovate[bot]@users.noreply.github.com>

Author: renovate[bot]

gradle.properties

@@ -4,7 +4,7 @@ datastoreVersion=8.0.4
 gebVersion=2.3
 grailsVersion=6.0.0
 grailsGradlePluginVersion=6.1.1
-groovyVersion=3.0.11
+groovyVersion=3.0.20
 h2Version=1.4.200
 hibernateCoreVersion=5.5.7.Final
 hibernatePluginVersion=8.0.2