Unfreeze v3.104.1 (pulumi#15335)

I was trying to speed up release of v3.104.1 by combining the change we
wanted to release and the freeze at the same time
(pulumi#15333), but that doesn't work. It
left us with a v3.104.2 draft release with the change. I should have
gotten the fix merged, and then followed up with a change to freeze it.

To address, we need to unfreeze and then refreeze.

sdk/.version

@@ -1 +1 @@
-3.104.2
+3.104.1