survey: No need to use musl based Python for stackage yaml parsing

Author: nh2

survey/default.nix

@@ -126,7 +126,7 @@ let
   stackagePackages =
     let
       stackageInfoPath = pkgs.path + "/pkgs/development/haskell-modules/configuration-hackage2nix/stackage.yaml";
-      pythonWithYaml = pkgs.python2Packages.python.withPackages (pkgs: [pkgs.pyyaml]);
+      pythonWithYaml = normalPkgs.python3Packages.python.withPackages (pkgs: [pkgs.pyyaml]);
       stackage-packages-file = normalPkgs.runCommand "stackage-packages" {} ''
         ${pythonWithYaml}/bin/python -c 'import yaml, json; x = yaml.load(open("${stackageInfoPath}")); print(json.dumps([line.split(" ")[0] for line in x["default-package-overrides"]]))' > $out
       '';