Support for ghc-9.0.1

[jneira]

• I've not found any issue or pr about, so i am not even sure if this already supports it

[vaclavsvejcar]

I guess there's unfortunately no progress on this one, right? I tried to contact @lspitzner about general status of Brittany, but unfortunately without any answer.

[jneira]

Maybe @tfausak could find some time to give a try 🙂 ?

[tfausak]

Oh boy. I'll take a look, but no promises 😄

[vaclavsvejcar]

@tfausak I'm happy to help if possible, but I have zero knowledge of Brittany's internals.

[tfausak]

I started a pull request to attempt this: #356. Unfortunately one of the dependencies doesn't build with GHC 9.0, so I'll have to fix that first.