Did Umbrel released v0.4.13 today?

Yes, after a major •release of 0.4.12 - announced here right before your post it was a new quick release to patch an error in an app that was included. If you do not use that app, is not really necessary to update to 0.4.13, you can wait for another major release. 0.4.13 is specifically for that app so is not affecting the rest of Umbrel.