flake.lock: Update

Flake lock file changes:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/0d347c56f6f41de822a4f4c7ff5072f3382db121' (2022-05-12)
  → 'github:numtide/flake-utils/04c1b180862888302ddfb2e3ad9eaa63afc60cf8' (2022-05-17)
• Updated input 'nix-pre-commit-hooks':
    'github:cachix/pre-commit-hooks.nix/e5e7b3b542e7f4f96967966a943d7e1c07558042' (2022-04-04)
  → 'github:cachix/pre-commit-hooks.nix/521a524771a8e93caddaa0ac1d67d03766a8b0b3' (2022-05-16)
• Updated input 'nixpkgs':
    'github:nixos/nixpkgs/79385ae0aacf7e02871cc8af0623123419dd7884' (2022-05-13)
  → 'github:nixos/nixpkgs/2d474d6a4a43a0348b78db68dc00c491032cf5cf' (2022-05-18)
• Updated input 'nixpkgs-unstable':
    'github:nixos/nixpkgs/d89d7af1ba23bd8a5341d00bdd862e8e9a808f56' (2022-05-12)
  → 'github:nixos/nixpkgs/1d7db1b9e4cf1ee075a9f52e5c36f7b9f4207502' (2022-05-16)
• Updated input 'sops-nix':
    'github:Mic92/sops-nix/c2614c4fe61943b3d280ac1892fcebe6e8eaf8c8' (2022-04-12)
  → 'github:Mic92/sops-nix/9681f04fa3b6af5b7eff6b086e46aee2cc2bdde2' (2022-05-15)
• Added input 'sops-nix/nixpkgs-21_11':
    'github:NixOS/nixpkgs/8b3398bc7587ebb79f93dfeea1b8c574d3c6dba1' (2022-05-14)

flake.lock

@@ -25,11 +25,11 @@
     },
     "flake-utils": {
       "locked": {
-        "lastModified": 1652372896,
-        "narHash": "sha256-lURGussfF3mGrFPQT3zgW7+RC0pBhbHzco0C7I+ilow=",
+        "lastModified": 1652776076,
+        "narHash": "sha256-gzTw/v1vj4dOVbpBSJX4J0DwUR6LIyXo7/SuuTJp1kM=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "0d347c56f6f41de822a4f4c7ff5072f3382db121",
+        "rev": "04c1b180862888302ddfb2e3ad9eaa63afc60cf8",
         "type": "github"
       },
       "original": {
@@ -109,11 +109,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1649054408,
-        "narHash": "sha256-wz8AH7orqUE4Xog29WMTqOYBs0DMj2wFM8ulrTRVgz0=",
+        "lastModified": 1652714503,
+        "narHash": "sha256-qQKVEfDe5FqvGgkZtg5Pc491foeiDPIOeycHMqnPDps=",
         "owner": "cachix",
         "repo": "pre-commit-hooks.nix",
-        "rev": "e5e7b3b542e7f4f96967966a943d7e1c07558042",
+        "rev": "521a524771a8e93caddaa0ac1d67d03766a8b0b3",
         "type": "github"
       },
       "original": {
@@ -141,11 +141,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1652442528,
-        "narHash": "sha256-ctD9BdjN7e6cBipm8k9xt+vgwlRApkvuJLSNdaVrphE=",
+        "lastModified": 1652881001,
+        "narHash": "sha256-k9JmPCojaJnqGz4aRXXT1HZqJKHCXijoMfBAb24abXk=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "79385ae0aacf7e02871cc8af0623123419dd7884",
+        "rev": "2d474d6a4a43a0348b78db68dc00c491032cf5cf",
         "type": "github"
       },
       "original": {
@@ -155,6 +155,22 @@
         "type": "github"
       }
     },
+    "nixpkgs-21_11": {
+      "locked": {
+        "lastModified": 1652559422,
+        "narHash": "sha256-jPVTNImBTUIFdtur+d4IVot6eXmsvtOcBm0TzxmhWPk=",
+        "owner": "NixOS",
+        "repo": "nixpkgs",
+        "rev": "8b3398bc7587ebb79f93dfeea1b8c574d3c6dba1",
+        "type": "github"
+      },
+      "original": {
+        "owner": "NixOS",
+        "ref": "release-21.11",
+        "repo": "nixpkgs",
+        "type": "github"
+      }
+    },
     "nixpkgs-overlay": {
       "inputs": {
         "flake-utils": [
@@ -183,11 +199,11 @@
     },
     "nixpkgs-unstable": {
       "locked": {
-        "lastModified": 1652378906,
-        "narHash": "sha256-DeV2myAMArPvyqxp0M6z30kuXb2L9SO2QXjxbbsZQyY=",
+        "lastModified": 1652659998,
+        "narHash": "sha256-FqNrXC1EE6U2RACwXBlsAvg1lqQGLYpuYb6+W3DL9vA=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "d89d7af1ba23bd8a5341d00bdd862e8e9a808f56",
+        "rev": "1d7db1b9e4cf1ee075a9f52e5c36f7b9f4207502",
         "type": "github"
       },
       "original": {
@@ -216,14 +232,15 @@
       "inputs": {
         "nixpkgs": [
           "nixpkgs"
-        ]
+        ],
+        "nixpkgs-21_11": "nixpkgs-21_11"
       },
       "locked": {
-        "lastModified": 1649756291,
-        "narHash": "sha256-KTll8bCINAzIUGaaMrbn9wb5nfhkXRLgmFrWGR/Dku0=",
+        "lastModified": 1652596508,
+        "narHash": "sha256-hwqENSMkOm+OwE1t459I3ZJmZmf+X7242QGskyftnaQ=",
         "owner": "Mic92",
         "repo": "sops-nix",
-        "rev": "c2614c4fe61943b3d280ac1892fcebe6e8eaf8c8",
+        "rev": "9681f04fa3b6af5b7eff6b086e46aee2cc2bdde2",
         "type": "github"
       },
       "original": {