commands: Handle hugo mod get --help

Fixes #11141

commands/mod.go

@@ -224,7 +224,7 @@ Run "go help get" for more information. All flags available for "go get" is also
 				run: func(ctx context.Context, cd *simplecobra.Commandeer, r *rootCommand, args []string) error {
 					// We currently just pass on the flags we get to Go and
 					// need to do the flag handling manually.
-					if len(args) == 1 && args[0] == "-h" {
+					if len(args) == 1 && args[0] == "-h" || args[0] == "--help" {
 						return errHelp
 					}