remove pre-ghc-9-2 nix stuff

Author: chris-martin

default.nix

@@ -1,7 +1,6 @@
 let
 
 sources = import ./nix/sources.nix;
-nixos-22-05 = import sources."nixos-22.05" {};
 nixos-22-11 = import sources."nixos-22.11" {};
 inherit (nixos-22-11) haskell lib symlinkJoin;
 inherit (lib) fold composeExtensions concatMap attrValues;
@@ -17,14 +16,6 @@ depOverrides = new: old: {
     # package-name = new.callPackage ./nix/package-name-0.0.0.0.nix {};
 };
 
-ghc."8.10" = nixos-22-05.haskell.packages.ghc8107.override (old: {
-    overrides = combineOverrides old [ sourceOverrides depOverrides ];
-});
-
-ghc."9.0" = nixos-22-11.haskell.packages.ghc90.override (old: {
-    overrides = combineOverrides old [ sourceOverrides depOverrides ];
-});
-
 ghc."9.2" = nixos-22-11.haskell.packages.ghc92.override (old: {
     overrides = combineOverrides old [ sourceOverrides depOverrides ];
 });