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_install.go b/metropolis/cli/metroctl/cmd_install.go
index 1f73d76..a34e470 100644
--- a/metropolis/cli/metroctl/cmd_install.go
+++ b/metropolis/cli/metroctl/cmd_install.go
@@ -86,9 +86,9 @@
 			},
 		}
 	} else {
-		cc, err := dialAuthenticated(ctx)
+		cc, err := newAuthenticatedClient(ctx)
 		if err != nil {
-			return nil, fmt.Errorf("while dialing node: %w", err)
+			return nil, fmt.Errorf("while creating client: %w", err)
 		}
 		mgmt := api.NewManagementClient(cc)
 		resT, err := mgmt.GetRegisterTicket(ctx, &api.GetRegisterTicketRequest{})