bump flake lock

flake.lock

@@ -351,11 +351,11 @@
     },
     "master": {
       "locked": {
-        "lastModified": 1645740083,
-        "narHash": "sha256-re4GMWyI5zN6+daJv5ejFi22Bm77jf82iEZA6HHWRAc=",
+        "lastModified": 1646061651,
+        "narHash": "sha256-7pg4dOlNpR9M/WcTyIioIgUk6J91DWdb72+OG1IRYeo=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "cb7aad71e54deaaea8cb02c7303f3e081c10a7f8",
+        "rev": "1516a6bfed0641c38b052e317fcd337a2c5003b4",
         "type": "github"
       },
       "original": {
@@ -423,11 +423,11 @@
     },
     "nixos": {
       "locked": {
-        "lastModified": 1645488570,
-        "narHash": "sha256-29Fvczhd20K3ol0wbQrFlsUiYUDoGnpOR2XJTdrRnZA=",
+        "lastModified": 1646044487,
+        "narHash": "sha256-2BN9xRr3NeLL9x9X66DiSATzm4nA/G0inc5D0+FtHTA=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "491ad20776074706da6befe0cb8334f2df23fc00",
+        "rev": "321b67a7448c79a110af2b9eceb0ad4b28f9db8c",
         "type": "github"
       },
       "original": {
@@ -440,7 +440,7 @@
     "nixos-generators": {
       "inputs": {
         "nixlib": "nixlib",
-        "nixpkgs": "nixpkgs_4"
+        "nixpkgs": "nixpkgs_3"
       },
       "locked": {
         "lastModified": 1637655461,
@@ -503,22 +503,6 @@
       }
     },
     "nixpkgs_3": {
-      "locked": {
-        "lastModified": 1644972330,
-        "narHash": "sha256-6V2JFpTUzB9G+KcqtUR1yl7f6rd9495YrFECslEmbGw=",
-        "owner": "NixOS",
-        "repo": "nixpkgs",
-        "rev": "19574af0af3ffaf7c9e359744ed32556f34536bd",
-        "type": "github"
-      },
-      "original": {
-        "owner": "NixOS",
-        "ref": "nixpkgs-unstable",
-        "repo": "nixpkgs",
-        "type": "github"
-      }
-    },
-    "nixpkgs_4": {
       "locked": {
         "lastModified": 1643381941,
         "narHash": "sha256-pHTwvnN4tTsEKkWlXQ8JMY423epos8wUOhthpwJjtpc=",