Update HTTP status codes to modern codes (#18063)

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

routers/web/user/setting/account_test.go

@@ -94,6 +94,6 @@ func TestChangePassword(t *testing.T) {
 		AccountPost(ctx)
 
 		assert.Contains(t, ctx.Flash.ErrorMsg, req.Message)
-		assert.EqualValues(t, http.StatusFound, ctx.Resp.Status())
+		assert.EqualValues(t, http.StatusSeeOther, ctx.Resp.Status())
 	}
 }