Update HTTP status codes to modern codes (#18063)

* 2xx/3xx/4xx/5xx -> http.Status...
* http.StatusFound -> http.StatusTemporaryRedirect
* http.StatusMovedPermanently -> http.StatusPermanentRedirect

modules/lfs/http_client_test.go

@@ -81,7 +81,7 @@ func lfsTestRoundtripHandler(req *http.Request) *http.Response {
 			Objects: []*ObjectResponse{
 				{
 					Error: &ObjectError{
-						Code:    404,
+						Code:    http.StatusNotFound,
 						Message: "Object not found",
 					},
 				},