Bump nixpkgs pins

[hamishmack]

No description provided.

[nrdxp]

I have found that hadrianEvalPackages has been removed in the upstream nixpkgs GHC package def, and confirmed it is no longer present in your unstable bump in this PR as well.

I have found that removing this override is enough to fix it, but not sure the best way to gracefully include that here, since you want to support both stable and unstable.

haskell.nix/modules/hackage.nix

Line 106 in d4fd889

'')).override { hadrianEvalPackages = config.evalPackages; };

[hamishmack]

I have found that hadrianEvalPackages has been removed in the upstream nixpkgs GHC package def,

I don't think it ever had it. I'm not sure how it build hadrian. The hadrianEvalPackages is for haskell.nix to use when it makes a plan for building hadrian.

I have found that removing this override is enough to fix it

Do you have an example of how to reproduce the issue? I'm wondering if it is related to using GHCJS 8.10.7 (that might not take the hadrianEvalPackages override).