update nixpkgs

nix/sources.json

@@ -35,10 +35,10 @@
         "homepage": "",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "65caf7cf6d705b61e053dc93e21249f8b7cf8dbf",
-        "sha256": "14gjc7nk2kqvzpwg6mgvp8xjsqb1nk1jdx1ld4csdqcd4knlxrkk",
+        "rev": "e296ed03e4a1611ea1c479c2644a587b1a85d5e4",
+        "sha256": "1p1n5ycsv2n72zahkkych7097vxhq30l7rk671awy69zra1pv2ss",
         "type": "tarball",
-        "url": "https://github.com/NixOS/nixpkgs/archive/65caf7cf6d705b61e053dc93e21249f8b7cf8dbf.tar.gz",
+        "url": "https://github.com/NixOS/nixpkgs/archive/e296ed03e4a1611ea1c479c2644a587b1a85d5e4.tar.gz",
         "url_template": "https://github.com/<owner>/<repo>/archive/<rev>.tar.gz"
     },
     "nixpkgs-21.05": {