Update nix and GithubActions to fourmolu-0.17.0.0

Author: lehins

.github/workflows/haskell.yml

@@ -378,7 +378,7 @@ jobs:
 
     - name: Install fourmolu
       run: |
-        FOURMOLU_VERSION="0.16.2.0"
+        FOURMOLU_VERSION="0.17.0.0"
         mkdir -p "$HOME/.local/bin"
         curl -sL "https://github.com/fourmolu/fourmolu/releases/download/v${FOURMOLU_VERSION}/fourmolu-${FOURMOLU_VERSION}-linux-x86_64" -o "$HOME/.local/bin/fourmolu"
         chmod a+x "$HOME/.local/bin/fourmolu"

flake.nix

@@ -77,7 +77,7 @@
 
         # see flake `variants` below for alternative compilers
         defaultCompiler = "ghc966";
-        fourmoluVersion = "0.16.2.0";
+        fourmoluVersion = "0.17.0.0";
         # We use cabalProject' to ensure we don't build the plan for
         # all systems.
         cabalProject = nixpkgs.haskell-nix.cabalProject' ({config, ...}: {