Update dependencies 2025-02

Commands used:

niv update --branch nixos-24.11 nixpkgs
niv init
niv update

• two manual edits (default.nix and stack.yaml)

nix/default.nix

@@ -14,7 +14,7 @@ let
     # haskell.nix provides access to the nixpkgs pins which are used by their CI,
     # hence you will be more likely to get cache hits when using these.
     # But you can also just use your own, e.g. '<nixpkgs>'.
-    haskellNix.sources.nixpkgs-2111 haskellNix.nixpkgsArgs;
+    haskellNix.sources.nixpkgs-2411 haskellNix.nixpkgsArgs;
 in
   pkgs.haskell-nix.project {
     src = pkgs.haskell-nix.haskellLib.cleanGit {