flake: update inputs (#36)

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/033b9f258ca96a10e543d4442071f614dc3f8412' (2023-04-09)
  → 'github:numtide/flake-utils/cfacdce06f30d2b68473a46042957675eebb3401' (2023-04-11)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/da0b0bc6a5d699a8a9ffbf9e1b19e8642307062a' (2023-04-09)
  → 'github:NixOS/nixpkgs/db34d7561caa508ece0265a56f382c5d3b7a6c1b' (2023-04-17)

Co-authored-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

flake.lock

@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1681037374,
-        "narHash": "sha256-XL6X3VGbEFJZDUouv2xpKg2Aljzu/etPLv5e1FPt1q0=",
+        "lastModified": 1681202837,
+        "narHash": "sha256-H+Rh19JDwRtpVPAWp64F+rlEtxUWBAQW28eAi3SRSzg=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "033b9f258ca96a10e543d4442071f614dc3f8412",
+        "rev": "cfacdce06f30d2b68473a46042957675eebb3401",
         "type": "github"
       },
       "original": {
@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1681064623,
-        "narHash": "sha256-UngFykv8KTrjxFeu4ZMvsOwFrxsa0A3ZPwyLhxb0Rrs=",
+        "lastModified": 1681693905,
+        "narHash": "sha256-XdXMvCt+i2ZcmAIPZvu3RUwcdaC9OX7d1WMAJJokzeA=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "da0b0bc6a5d699a8a9ffbf9e1b19e8642307062a",
+        "rev": "db34d7561caa508ece0265a56f382c5d3b7a6c1b",
         "type": "github"
       },
       "original": {