Update flake inputs

flake.lock

@@ -155,11 +155,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1619771587,
-        "narHash": "sha256-ICgBLhEygiLu524Xn8wnpFT547hInf2Zqpq0M59CBp4=",
+        "lastModified": 1619976063,
+        "narHash": "sha256-2tjVP95+qR1UzL8/UeV/xRJu7S2fRB7rf7enZedbrik=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "f3fec488b5efed9104742811862e434e8f992dc9",
+        "rev": "09fb9e425111878b58223852e87ed85e8a189e0d",
         "type": "github"
       },
       "original": {
@@ -187,11 +187,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1619893517,
-        "narHash": "sha256-lB4LCA2LAHMgq6LXOE4iBItXadscTrorOn1GlD2YLkQ=",
+        "lastModified": 1619970086,
+        "narHash": "sha256-93FzftIPlkQAapwb2Wq0IOktSUCsDW87tcKVWG5YnyQ=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "2685792d396d82cec5f68e33719055f862991179",
+        "rev": "dc326c78a93862efb30a76216f527a56496e6284",
         "type": "github"
       },
       "original": {
@@ -203,11 +203,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1619464443,
-        "narHash": "sha256-R7WAb8EnkIJxxaF6GTHUPytjonhB4Zm0iatyWoW169A=",
+        "lastModified": 1619987134,
+        "narHash": "sha256-QnN41tsjoVGV4zmvF3Fxrst2VZnoNXu5Lbb5ODNeBsE=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "8e4fe32876ca15e3d5eb3ecd3ca0b224417f5f17",
+        "rev": "4518794ee53d109d551c210a6d195b79e9995a90",
         "type": "github"
       },
       "original": {