handler: refactor Manager's cache options

In kubernetes-sigs/controller-runtime#2300 the
`cache.BuilderWithOptions` has been deprecated in favour of cache
options embeded in the Manager.

This PR rewrites our custom cache configuration to use the new way of
configuring it via those new options.

cmd/handler/main.go

@@ -172,8 +172,9 @@ func cacheResourcesOnNodes(ctrlOptions *ctrl.Options) {
 	nodeName := environment.NodeName()
 	metadataNameMatchingNodeNameSelector := fields.Set{"metadata.name": nodeName}.AsSelector()
 	nodeLabelMatchingNodeNameSelector := labels.Set{nmstateapi.EnactmentNodeLabel: nodeName}.AsSelector()
-	ctrlOptions.NewCache = cache.BuilderWithOptions(cache.Options{
-		SelectorsByObject: cache.SelectorsByObject{
+
+	ctrlOptions.Cache = cache.Options{
+		ByObject: map[client.Object]cache.ByObject{
 			&corev1.Node{}: {
 				Field: metadataNameMatchingNodeNameSelector,
 			},
@@ -184,7 +185,7 @@ func cacheResourcesOnNodes(ctrlOptions *ctrl.Options) {
 				Label: nodeLabelMatchingNodeNameSelector,
 			},
 		},
-	})
+	}
 }
 
 func setupHandlerControllers(mgr manager.Manager) error {