nix: update flake lock

Was unfortunately not able to implement vm test suite before this release. Hopefully the last nixos update we have to follow.

Signed-off-by: Ophestra <cat@gensokyo.uk>

flake.nix

@@ -2,10 +2,10 @@
   description = "hakurei container tool and nixos module";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05";
 
     home-manager = {
-      url = "github:nix-community/home-manager/release-25.11";
+      url = "github:nix-community/home-manager/release-26.05";
       inputs.nixpkgs.follows = "nixpkgs";
     };
   };
@@ -37,7 +37,7 @@
           inherit (pkgs)
             runCommandLocal
             callPackage
-            nixfmt-rfc-style
+            nixfmt
             deadnix
             statix
             ;
@@ -57,7 +57,7 @@
 
           sharefs = callPackage ./cmd/sharefs/test { inherit system self; };
 
-          formatting = runCommandLocal "check-formatting" { nativeBuildInputs = [ nixfmt-rfc-style ]; } ''
+          formatting = runCommandLocal "check-formatting" { nativeBuildInputs = [ nixfmt ]; } ''
             cd ${./.}
 
             echo "running nixfmt..."