bump flake

Signed-off-by: oppiliappan <[e-mail]>

flake.lock

···
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1758427187,
-        "narHash": "sha256-pHpxZ/IyCwoTQPtFIAG2QaxuSm8jWzrzBGjwQZIttJc=",
+        "lastModified": 1764522689,
+        "narHash": "sha256-SqUuBFjhl/kpDiVaKLQBoD8TLD+/cTUzzgVFoaHrkqY=",
         "owner": "nixos",
         "repo": "nixpkgs",
-        "rev": "554be6495561ff07b6c724047bdd7e0716aa7b46",
+        "rev": "8bb5646e0bed5dbd3ab08c7a7cc15b75ab4e1d0f",
         "type": "github"
       },
       "original": {
         "owner": "nixos",
-        "ref": "nixos-unstable",
+        "ref": "nixos-25.11",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

···
 {
   description = "nix infra for tangled";
   inputs = {
-    nixpkgs.url = "github:nixos/nixpkgs?ref=nixos-unstable";
+    nixpkgs.url = "github:nixos/nixpkgs/nixos-25.11";
     tangled.url = "git+https://tangled.org/@tangled.org/core";
     colmena.url = "github:zhaofengli/colmena/release-0.4.x";
     disko = {