update nix/sources.json

Author: songgaoye

nix/sources.json

@@ -54,7 +54,7 @@
         "owner": "NixOS",
         "repo": "nixpkgs",
         "rev": "994ca2f0ad146d4ea17313e7336c7436a20d87b4",
-        "sha256": "00ghsa6842lkd0c0k0ln6531inq03y4m0nphczwnhf5n9g72sddh",
+        "sha256": "0hhplqdrvcicmhlmg9c9yw9x37zjh2chfv89hcdhb5gzyxmw4l73",
         "type": "tarball",
         "url": "https://github.com/NixOS/nixpkgs/archive/994ca2f0ad146d4ea17313e7336c7436a20d87b4.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"