Update Nixpkgs input

flake.lock

@@ -33,16 +33,16 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1615205753,
-        "narHash": "sha256-XIYZwHzrTgRkwQ8Dl+yoFbkOHxPinWlp11X8m4IOxHQ=",
-        "owner": "ehmry",
+        "lastModified": 1617984351,
+        "narHash": "sha256-mo/tmR1sVmQ+4uziIAZpdNnr9AG0NAAo9Md3tucf73k=",
+        "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "c5de11a19e5c30fce1b1abf5e3e71489e2666f5e",
+        "rev": "842f900e73c7ce985218cc4f455e34d1d56475c1",
         "type": "github"
       },
       "original": {
-        "owner": "ehmry",
-        "ref": "genodepkgs",
+        "owner": "NixOS",
+        "ref": "nixpkgs-unstable",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -1,7 +1,7 @@
 {
   description = "Nix flavored Genode distribution";
 
-  inputs.nixpkgs.url = "github:ehmry/nixpkgs/genodepkgs";
+  inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixpkgs-unstable";
 
   outputs = { self, nixpkgs, nimble }:
     let
@@ -101,30 +101,6 @@
                   }) erisInfo);
             in assert length caps == 1; head caps;
 
-          generators = prev.generators // rec {
-            toDhall = { }:
-              x:
-              with builtins;
-              let concatItems = final.strings.concatStringsSep ", ";
-              in if isAttrs x then
-                "{ ${
-                  concatItems (prev.attrsets.mapAttrsToList
-                    (key: value: "${key} = ${toDhall { } value}") x)
-                } }"
-              else if isList x then
-                "[ ${concatItems (map (toDhall { }) x)} ]"
-              else if isString x || isPath x then
-                ''"${x}"''
-              else if isInt x then
-                "${if x < 0 then "" else "+"}${toString}"
-              else if isFloat x then
-                toString x
-              else if isBool x then
-                (if x then "True" else "False")
-              else
-                "abort generators.toDhall: unhandled value (${x})";
-          };
-
           uuidFrom = seed:
             let digest = builtins.hashString "sha256" seed;
             in (lib.lists.foldl ({ str, off }: