flake: update inputs (#48)

Flake lock file updates:

• Updated input 'flake-utils':
    'github:numtide/flake-utils/a1720a10a6cfe8234c0e93907ffe81be440f4cef' (2023-05-31)
  → 'github:numtide/flake-utils/dbabf0ca0c0c4bce6ea5eaf65af5cb694d2082c7' (2023-06-25)
• Updated input 'nixpkgs':
    'github:NixOS/nixpkgs/91430887645a0953568da2f3e9a3a3bb0a0378ac' (2023-06-18)
  → 'github:NixOS/nixpkgs/07059ee2fa34f1598758839b9af87eae7f7ae6ea' (2023-06-25)

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

flake.lock

@@ -5,11 +5,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1685518550,
-        "narHash": "sha256-o2d0KcvaXzTrPRIo0kOLV0/QXHhDQ5DTi+OxcjO8xqY=",
+        "lastModified": 1687709756,
+        "narHash": "sha256-Y5wKlQSkgEK2weWdOu4J3riRd+kV/VCgHsqLNTTWQ/0=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "a1720a10a6cfe8234c0e93907ffe81be440f4cef",
+        "rev": "dbabf0ca0c0c4bce6ea5eaf65af5cb694d2082c7",
         "type": "github"
       },
       "original": {
@@ -20,11 +20,11 @@
     },
     "nixpkgs": {
       "locked": {
-        "lastModified": 1687103638,
-        "narHash": "sha256-dwy/TK6Db5W7ivcgmcxUykhFwodIg0jrRzOFt7H5NUc=",
+        "lastModified": 1687701825,
+        "narHash": "sha256-aMC9hqsf+4tJL7aJWSdEUurW2TsjxtDcJBwM9Y4FIYM=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "91430887645a0953568da2f3e9a3a3bb0a0378ac",
+        "rev": "07059ee2fa34f1598758839b9af87eae7f7ae6ea",
         "type": "github"
       },
       "original": {