Fix UFlow links

[ashwinvaidya17]

📝 Description

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[ashwinvaidya17]

@mtailanian can you have a look at this?

[mtailanian]

This was just the first change; I didn't mean to send the PR. I apologize...

[ashwinvaidya17]

This was just the first change; I didn't mean to send the PR. I apologize...

That's alright. But if you think that this is the right link then we can merge the PR.

[mtailanian]

Yes, the new link is correct. I'm linking to the new GitHub release with the pre-trained checkpoints.
Later, I'll also update the link to the final paper and a couple of things in the code. I meant to do it all at once, but sure, it can be merged.

Thanks!