nixpkgs: bump 25.11 -> 26.05

Change-Id: I7747d38d38f3be69404f5dcc8147e5366a6a6964

flake.lock

@@ -106,16 +106,16 @@
     },
     "nixpkgs_2": {
       "locked": {
-        "lastModified": 1773082486,
-        "narHash": "sha256-TKUDrM0nKUo5s/b8jhjXa2prcu5KU5Cck3HBTRLDjfo=",
+        "lastModified": 1780020239,
+        "narHash": "sha256-ik+V883hTc6GG7TzjxMdhEoMV0hCbQPfsRtNsB1qWUQ=",
         "owner": "NixOS",
         "repo": "nixpkgs",
-        "rev": "7f8b8875bdb38a70c7b5ceb9ba6a6a8d69859e16",
+        "rev": "c85dc29a9bcafa665b8ce0654ca019cdb05e63c6",
         "type": "github"
       },
       "original": {
         "owner": "NixOS",
-        "ref": "nixos-25.11-small",
+        "ref": "nixos-26.05-small",
         "repo": "nixpkgs",
         "type": "github"
       }

flake.nix

@@ -2,7 +2,7 @@
   description = "Lix: A modern, delicious implementation of the Nix package manager";
 
   inputs = {
-    nixpkgs.url = "github:NixOS/nixpkgs/nixos-25.11-small";
+    nixpkgs.url = "github:NixOS/nixpkgs/nixos-26.05-small";
     nixpkgs-regression.url = "github:NixOS/nixpkgs/215d4d0fd80ca5163643b03a33fde804a29cc1e2";
 
     # Required because Nix 2.18 is not in Nixpkgs ≥ 25.05 anymore.

misc/pre-commit.nix

@@ -140,7 +140,7 @@ pre-commit-run {
     treefmt = {
       enable = true;
       settings.formatters = [
-        pkgs.nixfmt-rfc-style
+        pkgs.nixfmt
         pkgs.ruff
       ];
     };

nix-support/build/outputs.nix

@@ -196,15 +196,5 @@ lib.fix (self: {
         doCheck = false;
         doInstallCheck = false;
       });
-  }
-  // lib.optionalAttrs (nixpkgsFor ? aarch64-linux) {
-    build-lowdown_2_0 = lib.genAttrs [ "aarch64-linux" ] (
-      system:
-      assert lib.versionOlder nixpkgsFor.${system}.native.lowdown.version "3.0.0";
-      self.packages.${system}.nix.override {
-        lowdown = nixpkgsFor.${system}.native.lowdown;
-        lowdown-unsandboxed = nixpkgsFor.${system}.native.lowdown-unsandboxed;
-      }
-    );
   };
 })

package.nix

@@ -691,7 +691,7 @@ stdenv.mkDerivation (finalAttrs: {
         doxygen,
         glibcLocales,
         just,
-        nixfmt-rfc-style,
+        nixfmt,
         skopeo,
         tree,
 
@@ -765,7 +765,7 @@ stdenv.mkDerivation (finalAttrs: {
               # docker image tool
               skopeo
               just
-              nixfmt-rfc-style
+              nixfmt
               # Included above when internalApiDocs is true, but we set that to
               # false intentionally to save dev build time.
               # To build them in a dev shell, you can set -Dinternal-api-docs=enabled when configuring.