Fix NPX issue with TailwindCSS v4

This allows the `tailwindcss` CLI binary to live in the `PATH` for NPM-less projects.

Fixes #13221

markup/rst/convert_test.go

@@ -36,7 +36,7 @@ func TestConvert(t *testing.T) {
 	p, err := Provider.New(
 		converter.ProviderConfig{
 			Logger: loggers.NewDefault(),
-			Exec:   hexec.New(sc, ""),
+			Exec:   hexec.New(sc, "", loggers.NewDefault()),
 		})
 	c.Assert(err, qt.IsNil)
 	conv, err := p.New(converter.DocumentContext{})