Bump websockets LB & mtl, transformers UB.

This should work after these land:

- https://github.com/jaspervdj/websockets/pull/73
- https://github.com/CodeBlock/trifecta/commit/a67f4372f53b0c9122514187f6666825795b1437
- https://github.com/W8UPD/configurator/commit/3d559719d128f035008f1b43751804edc2f998eb

Cabal can be evil sometimes.

Signed-off-by: Ricky Elrod <ricky@elrod.me>