cabal-hie: write output to stdout

[lf-]

Hi!

I found out about cabal-hie through Avi-D-coder/implicit-hie#50, and it looks like it almost does exactly what I'd like, but it seems to unconditionally overwrite hie.yaml, which is undesirable in complex project configurations.

I would love to have a mode that prints out the new hie.yaml file without overwriting the existing one, such that changes can be merged in manually.

I also got it ported to compile on GHC 9.2, but just changing bounds on cabal-hie and ignoring everything else in cabal.project. Would you like me to submit those bounds fixes anyway?