mercure: 0.20.2 -> 0.21.6 (#477741)

- `lima` has been updated from `1.x` to `2.x`. This major update includes several breaking changes, such as `/tmp/lima` no longer being mounted by default.

- `mercure` has been update to `0.21.4` (or later). Version [0.21.0](https://github.com/dunglas/mercure/releases/v0.21.0) and [0.21.2](https://github.com/dunglas/mercure/releases/tag/v0.21.2) introduce breaking changes to the package.

- `n8n` has been updated to version 2. You can find the breaking changes here: https://docs.n8n.io/2-0-breaking-changes/.

- `gurk-rs` has been updated from `0.6.4` to `0.8.0`. Version `0.8.0` includes breaking changes. For more information read the [release notes for 0.8.0](https://github.com/boxdot/gurk-rs/releases/tag/v0.8.0).

buildGoModule rec {

  pname = "mercure";

  version = "0.20.2";

  version = "0.21.6";

  src = fetchFromGitHub {

    owner = "dunglas";

    repo = "mercure";

    rev = "v${version}";

    hash = "sha256-DmeBnvJhGYtEGoJDey8+Bb7MuP+Y1GLtQHg6QLoAzv4=";

    hash = "sha256-hCEoEs6NiShssKER1Z8IVQPF+Ir7wbreGInWmcdnqzE=";

  };

  sourceRoot = "${src.name}/caddy";

  vendorHash = "sha256-ZisV7+Mo8TMN+AUGPKHzEluzEShxZCuXrnYgySi57TY=";

  vendorHash = "sha256-GTHJtNO4JqTEDxVMe0yTgnjhfK2aGZpjMTfSFtL29IU=";

  subPackages = [ "mercure" ];

  excludedPackages = [ "../cmd/mercure" ];