fix(deps): update groovy monorepo to v4.0.21 (main) (patch) (#11064)

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

dependencyManagement/build.gradle.kts

@@ -13,7 +13,7 @@ val otelContribVersion = "1.34.0-alpha"
 val otelSdkAlphaVersion = otelSdkVersion.replaceFirst("(-SNAPSHOT)?$".toRegex(), "-alpha$1")
 
 // Need both BOM and groovy jars
-val groovyVersion = "4.0.20"
+val groovyVersion = "4.0.21"
 
 // We don't force libraries we instrument to new versions since we compile and test against specific
 // old baseline versions but we do try to force those libraries' transitive dependencies to new