fix(deps): update groovy monorepo to v4.0.21 (#10703)

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

gradle/libs.versions.toml

@@ -59,7 +59,7 @@ wiremock = "2.33.2"
 # Versions which start with managed- are managed by Micronaut in the sense
 # that they will appear in the Micronaut BOM as <properties>
 #
-managed-groovy = "4.0.20"
+managed-groovy = "4.0.21"
 managed-jakarta-annotation-api = "2.1.1"
 managed-jackson = "2.16.1"
 managed-jackson-databind = "2.17.0"