nix shells: revert hls to 1.8.0.0

 due to haskell/haskell-language-server#3427

Author: jbgi

nix/pkgs.nix

@@ -25,7 +25,9 @@ final: prev: with final; {
   };
 
   haskell-language-server = haskell-nix.tool compiler-nix-name "haskell-language-server" {
-    version = "latest";
+    # XXX waiting for https://github.com/haskell/haskell-language-server/issues/3427
+    # before switching back to latest:
+    version = "1.8.0.0";
     inherit (cardanoNodeProject) index-state;
   };
 

nix/workbench/shell.nix

@@ -83,15 +83,9 @@ in project.shellFor {
   # (the default is *local* packages which includes them, we select *project* pacakges which doesn't)
   packages = ps: builtins.attrValues (haskellLib.selectProjectPackages ps);
 
-  tools = {
-    haskell-language-server = {
-      version = "latest";
-      inherit (project) index-state;
-    };
-  };
-
   # These programs will be available inside the nix-shell.
   nativeBuildInputs = with pkgs; with haskellPackages; with cardanoNodePackages; [
+    haskell-language-server
     cardano-ping
     db-analyser
     pkgs.graphviz