Support `nixpkgs/release-24.11` branch

[yxtay]

nix 2.26.0 use nixpkgs/release-24.11 branch. I think this should be a supported branch in flake-checker.

https://github.com/NixOS/nix/blob/2.26.0/flake.nix#L4

Flake checker results:

The flake checker scanned your flake.lock and discovered 1 issue
that we recommend looking into:

>>> Non-supported Git branches for Nixpkgs

> The nixpkgs input uses the release-24.11 branch

>> What to do

Use one of these branches instead:

* nixos-24.05
* nixos-24.05-small
* nixos-24.11
* nixos-24.11-small
* nixos-unstable
* nixos-unstable-small
* nixpkgs-24.05-darwin
* nixpkgs-24.11-darwin
* nixpkgs-unstable

>> Why it's important to use supported branches

NixOS's release branches stop receiving updates roughly 7 months after release
and then gradually become more and more insecure over time. Non-release branches
receive unpredictable updates and should be avoided as dependencies. Release
branches are also certain to have good binary cache coverage, which other
branches can't promise.