bump nixpkgs

nixpkgs.json

 {
   "name": "source",
-  "url": "https://releases.nixos.org/nixos/24.05/nixos-24.05.5366.fbca5e745367/nixexprs.tar.xz",
-  "sha256": "0az60wyj4jj1vhvpn5yw04n8x5ldbmh5sk39321357bybz4pal9h"
+  "url": "https://releases.nixos.org/nixos/24.05/nixos-24.05.5518.ecbc1ca8ffd6/nixexprs.tar.xz",
+  "sha256": "1yr2v17d8jg9567rvadv62bpr6i47fp73by2454yjxh1m9ric2cm"
 }
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