Update haskell.nix, ghc and nixpkgs

[hamishmack]

No description provided.

[michalrus]

I merged in #389 – these two PRs basically try to do the same thing.

[michalrus]

IMO, let's merge this, despite the fact there are a few failures in cardano-shell. For all I know, it's not used, and the only thing used from this repo is cardano-launcher (by Daedalus, and Lace), and this exact revision has been working well in Daedalus and Lace Desktop for a long time now.

To reproduce, run:

nix-build -k release.nix -A required

Failures:

  test/NodeIPCSpec.hs:63:9: 
  1) NodeIPC.startIPC should return Started and ShutdownInitiated when client sends message 'Shutdown'
       uncaught exception: ExitCode
       ExitFailure 22
       (after 1 test)

  To rerun use: --match "/NodeIPC/startIPC/should return Started and ShutdownInitiated when client sends message 'Shutdown'/"

  test/NodeIPCSpec.hs:70:13: 
  2) NodeIPC.startIPC.Exceptions should throw NodeIPCError when closed handle is given
       Assertion failed (after 1 test):

  To rerun use: --match "/NodeIPC/startIPC/Exceptions/should throw NodeIPCError when closed handle is given/"

  test/NodeIPCSpec.hs:78:13: 
  3) NodeIPC.startIPC.Exceptions should throw NodeIPCError when unreadable handle is given
       Assertion failed (after 1 test):

  To rerun use: --match "/NodeIPC/startIPC/Exceptions/should throw NodeIPCError when unreadable handle is given/"

  test/NodeIPCSpec.hs:86:13: 
  4) NodeIPC.startIPC.Exceptions should throw NodeIPCError when unwritable handle is given
       Assertion failed (after 1 test):

  To rerun use: --match "/NodeIPC/startIPC/Exceptions/should throw NodeIPCError when unwritable handle is given/"

  test/NodeIPCSpec.hs:95:13: 
  5) NodeIPC.startIPC, Resource cleanup, should throw NodeIPCError when IOError is being thrown
       uncaught exception: IOException of type EOF
       Failed with eofe: end of file
       (after 59 tests)

  To rerun use: --match "/NodeIPC/startIPC/Resource cleanup/should throw NodeIPCError when IOError is being thrown/"

Randomized with seed 741501488