WIP TEMP nix update, don't mere this!

Not until NixOS/nix#10748 lands

Flake lock file updates:

• Updated input 'nix':
    'github:NixOS/nix/970942f45836172fda410a638853382952189eb9?narHash=sha256-jGFuyYKJjJZsBRoi7ZcaVKt1OYxusz/ld1HA7VD2w/0%3D' (2025-02-12)
  → 'github:NixOS/nix/5eade4825221d3284fc6555cb20de2c7aa171d72?narHash=sha256-n5kdS1C24tlJxDV6Wm1iBlyvGk%2Bp0gMXRcWVCAipYLs%3D' (2025-02-14)

• Updated input 'nix-eval-jobs':
    'github:Ericson2314/nix-eval-jobs/5e27c2724a4b07862e7ff1a198aa2ed68dea3e2c?narHash=sha256-7xgSdKnQW11eWd59MnpUNS%2BgwgtOJH2ShzLwByev3rg%3D' (2025-02-14)
  → 'github:Ericson2314/nix-eval-jobs/de345eb4518d952c2d86261b270f2c31edecd3de?narHash=sha256-dNMJY6%2BG3PwE8lIAhwetPJdA2DxCEKRXPY/EtHmdDh4%3D' (2025-02-14)

flake.nix

@@ -4,7 +4,7 @@
   inputs.nixpkgs.url = "github:NixOS/nixpkgs/nixos-24.11-small";
 
   inputs.nix = {
-    url = "github:NixOS/nix/2.26-maintenance";
+    url = "github:NixOS/nix/legacy-ssh-extensions-for-hydra";
     inputs.nixpkgs.follows = "nixpkgs";
 
     # hide nix dev tooling from our lock file
@@ -13,10 +13,11 @@
     inputs.nixpkgs-regression.follows = "";
     inputs.nixpkgs-23-11.follows = "";
     inputs.flake-compat.follows = "";
+    inputs.nixfmt.follows = "";
   };
 
   inputs.nix-eval-jobs = {
-    url = "github:nix-community/nix-eval-jobs";
+    url = "github:Ericson2314/nix-eval-jobs/nix-2.27";
     # We want to control the deps precisely
     flake = false;
   };