treewide: replace deprecated grpc.Dial with grpc.NewClient

Change-Id: I925912ca1ee01d547fd9c1813eb083a2cd9a590a
Reviewed-on: https://review.monogon.dev/c/monogon/+/3858
Reviewed-by: Jan Schär <jan@monogon.tech>
Tested-by: Jenkins CI
diff --git a/metropolis/cli/metroctl/cmd_node_metrics.go b/metropolis/cli/metroctl/cmd_node_metrics.go
index 6b108ae..648fe60 100644
--- a/metropolis/cli/metroctl/cmd_node_metrics.go
+++ b/metropolis/cli/metroctl/cmd_node_metrics.go
@@ -48,9 +48,9 @@
 
 		// First connect to the main management service and figure out the node's IP
 		// address.
-		cc, err := dialAuthenticated(ctx)
+		cc, err := newAuthenticatedClient(ctx)
 		if err != nil {
-			return fmt.Errorf("while dialing node: %w", err)
+			return fmt.Errorf("while creating client: %w", err)
 		}
 		mgmt := api.NewManagementClient(cc)
 		nodes, err := core.GetNodes(ctx, mgmt, fmt.Sprintf("node.id == %q", args[0]))