Doom has removed hydra

[dpbriggs]

Hi! Thanks for making this module. Unfortunately it looks like doom has removed the hydra module. Do you know if I could work around this?

[Hezzeki]

I removed :ui hydra from init.el, then added in (packages.el):
(package! hydra :pin "317e1de33086637579a7aeb60f77ed0405bf359b")
Re-sync'd then it is seemingly fixed.