Nix updates

Author: erikd

flake.lock

@@ -56,8 +56,8 @@ let
     src = ../.;
     # our current release compiler is 8107
     compiler-nix-name = lib.mkDefault "ghc8107";
-    # but we also build for 927.
-    flake.variants = lib.genAttrs ["ghc927"] (x: {compiler-nix-name = x;});
+    # but we also build for 962.
+    flake.variants = lib.genAttrs ["ghc962"] (x: {compiler-nix-name = x;});
 
     shell = {
       name = "cabal-dev-shell";