Update nixpkgs

flake.lock

@@ -2,12 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1616527350,
-        "narHash": "sha256-VkMevY2WLU+K7T/P4wVj18Ms8zyeRfp05ILf556m5Y8=",
-        "owner": "nixos",
-        "repo": "nixpkgs",
-        "rev": "d3f7e969b9860fb80750147aeb56dab1c730e756",
-        "type": "github"
+        "lastModified": 1631118067,
+        "narHash": "sha256-tEcFvm3a6ToeBGwHdjfB2mVQwa4LZCZTQYE2LnY3ycA=",
+        "path": "/nix/store/6dcqil119qr3sad2lp9ykkkc852ppmqm-source",
+        "rev": "09cd65b33c5653d7d2954fef4b9f0e718c899743",
+        "type": "path"
       },
       "original": {
         "id": "nixpkgs",