flake.lock: Update (#37)

Flake lock file updates:

• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/5d91a896449650d13fbba8c8abc65d1615c2b654' (2023-04-23)
  → 'github:NixOS/nixpkgs/bc9a078705e21323f8a51f4cc86618bd4a5f8fb2' (2023-04-30)
• Updated input 'treefmt-nix':
    'github:numtide/treefmt-nix/b25d1a3c2c7554d0462ab1dfddf2f13128638b90' (2023-04-14)
  → 'github:numtide/treefmt-nix/6d8bea2820630576ad8c3a3bde2c95c38bcc471f' (2023-04-26)

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

flake.lock

@@ -22,11 +22,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1682266827,
+        "lastModified": 1682886420,
-        "narHash": "sha256-K+ZriFdFKMWbJ+IjJf3LJAKp3KePOvO76W2mzlxdsA4=",
+        "narHash": "sha256-0fBSD9x/toYP2WUfOvybNEu24K8cn7VjBfZ5xVNagl0=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5d91a896449650d13fbba8c8abc65d1615c2b654",
+        "rev": "bc9a078705e21323f8a51f4cc86618bd4a5f8fb2",
         "type": "github"
       },
       "original": {
@@ -50,11 +50,11 @@
         ]
       },
       "locked": {
-        "lastModified": 1681486253,
+        "lastModified": 1682536470,
-        "narHash": "sha256-EjiQZvXQH9tUPCyLC6lQpfGnoq4+kI9v59bDJWPicYo=",
+        "narHash": "sha256-dGR2FRxWswpQCHdivejB3uiLZPktnT3DYp6ZkybR/SE=",
         "owner": "numtide",
         "repo": "treefmt-nix",
-        "rev": "b25d1a3c2c7554d0462ab1dfddf2f13128638b90",
+        "rev": "6d8bea2820630576ad8c3a3bde2c95c38bcc471f",
         "type": "github"
       },
       "original": {