update nixpkgs-unstable

Author: cdmistman

nix/sources.json

@@ -124,10 +124,10 @@
         "homepage": "",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "650e572363c091045cdbc5b36b0f4c1f614d3058",
-        "sha256": "150ip7d1izr4falxvnidgjmisbfja17rp4afigigld2hlhndafm7",
+        "rev": "6b4955211758ba47fac850c040a27f23b9b4008f",
+        "sha256": "1x07lw8lw3njb3f1ag71pfzirr7qwrasj1l3symxb4x2v450pw3l",
         "type": "tarball",
-        "url": "https://github.com/nixos/nixpkgs/archive/650e572363c091045cdbc5b36b0f4c1f614d3058.tar.gz",
+        "url": "https://github.com/nixos/nixpkgs/archive/6b4955211758ba47fac850c040a27f23b9b4008f.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "prybar": {