For those wondering why it took so long for 4.6.3 to release outside of the official website, I can answer that. About a week after 4.6.3 released on the website, I noticed that the Steam version hadn’t been updated, and asked about it in the Godot contributor’s chat.
From Akien, one of the lead developers:
It was forgotten / it’s a part of the process @Repiteo isn’t experienced with yet. I can deploy it but I’m away at an event until Friday.
In other words, the delay wasn’t intentional - it was just an honest mistake, one that they only realized when it was pointed out.