Nix: Update inputs

I've been using the nix shell with my system's copy of nixpkgs, running
it against the flake nixpkgs fails due to lua5_5 not being present.
Simply needs an update to fix that.

flake.lock

@@ -2,11 +2,11 @@
   "nodes": {
     "nixpkgs": {
       "locked": {
-        "lastModified": 1754214453,
-        "narHash": "sha256-Q/I2xJn/j1wpkGhWkQnm20nShYnG7TI99foDBpXm1SY=",
+        "lastModified": 1791734076,
+        "narHash": "sha256-i5qk1kLiit98rRbh1AXmWBNT9QXC/y4l5Wk/u5EdpDQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "5b09dc45f24cf32316283e62aec81ffee3c3e376",
+        "rev": "7fd4004d0511991fff3a0524856a9be09e28c5f0",
         "type": "github"
       },
       "original": {
@@ -42,11 +42,11 @@
         "systems": "systems"
       },
       "locked": {
-        "lastModified": 1731533236,
-        "narHash": "sha256-l0KFg5HjrsfsO/JpG+r7fRrqm12kzFHyUHqHCVpMMbI=",
+        "lastModified": 1791914995,
+        "narHash": "sha256-Zf/xfQEAasnwnmEfHqW/4hjDE/s44yn2hD4RuVIZRjA=",
         "owner": "numtide",
         "repo": "flake-utils",
-        "rev": "11707dc2f618dd54ca8739b309ec4fc024de578b",
+        "rev": "b7a79d3fea1e214f6d668d521cecec0c01e26544",
         "type": "github"
       },
       "original": {