Merge #2947

2947: Add Nix expressions required to use newest fmt library r=sevanspowell a=sevanspowell

- We want to update to the newest fmt library (fmt-6.3.0) to make use of new Buildable instances.
- Ran `niv update haskell.nix` to get latest hackage.nix, which provides us with the Nix expressions for fmt-6.3.0.
- There is some build issue with haskell-language-server-1.2.0.0 and the version of haskell.nix we've pinned, so update haskell-language-server to 1.4.0.0.
- Update the index-state so we can build it.
- `./nix/regenerate.sh`: regenerate the materialized files


Co-authored-by: Samuel Evans-Powell <mail@sevanspowell.net>
Co-authored-by: IOHK <devops+stack-project@iohk.io>

cabal.project

@@ -38,8 +38,8 @@
 --
 --------------------------------------------------------------------------------
 
-index-state: 2021-06-30T00:00:00Z
-with-compiler: ghc-8.10.5
+index-state: 2021-10-05T00:00:00Z
+with-compiler: ghc-8.10.7
 
 packages:
     lib/core/

lib/core/src/Cardano/Wallet/Compat.hs

@@ -2,7 +2,7 @@
 -- Copyright: © 2021 IOHK
 -- License: Apache-2.0
 --
--- Temporary compatibility functions for the ghc-8.10.4 update.
+-- Temporary compatibility functions for the ghc-8.10 update.
 
 module Cardano.Wallet.Compat
     ( (^?)

nix/default.nix

@@ -28,7 +28,7 @@ let
       (builtins.trace "Not using Haskell.nix nixpkgs pin (use 'niv drop nixpkgs' to use default for better sharing)"
       sources.nixpkgs)
     # else iohkNixMain.nixpkgs;
-    else haskellNix.sources.nixpkgs-unstable;
+    else haskellNix.sources.nixpkgs;
 
   # for inclusion in pkgs:
   overlays =

nix/haskell.nix

@@ -302,6 +302,10 @@ let
           # "stm" "terminfo"
         ];
       }
+      {
+        packages.cardano-wallet-core.components.library.build-tools = [ pkgs.buildPackages.buildPackages.gitMinimal ];
+        packages.cardano-config.components.library.build-tools = [ pkgs.buildPackages.buildPackages.gitMinimal ];
+      }
     ];
   };