Update examples/cluster-api/go.mod to depend on v0.20.4-alpha.6

Author: sttts

examples/cluster-api/go.mod

@@ -14,8 +14,8 @@ require (
 	k8s.io/client-go v0.32.2
 	sigs.k8s.io/cluster-api v1.9.4
 	sigs.k8s.io/controller-runtime v0.20.4
-	sigs.k8s.io/multicluster-runtime v0.20.0-alpha.5
-	sigs.k8s.io/multicluster-runtime/providers/cluster-api v0.20.0-alpha.5
+	sigs.k8s.io/multicluster-runtime v0.20.4-alpha.6
+	sigs.k8s.io/multicluster-runtime/providers/cluster-api v0.20.4-alpha.6
 )
 
 require (