chore(deps): update module gopkg.in/go-playground/webhooks.v5 to v6

Author: renovate[bot]

go.mod

@@ -82,7 +82,7 @@ require (
 	google.golang.org/api v0.265.0
 	google.golang.org/genproto/googleapis/api v0.0.0-20260209200024-4cfbd4190f57
 	google.golang.org/grpc v1.79.2
-	gopkg.in/go-playground/webhooks.v5 v5.17.0
+	gopkg.in/go-playground/webhooks.v6 v6.4.0
 	gopkg.in/yaml.v3 v3.0.1
 	k8s.io/api v0.33.1
 	k8s.io/apiextensions-apiserver v0.33.1