polkadot: 2503 -> 2503-2 (#406132)

in

rustPlatform.buildRustPackage rec {

  pname = "polkadot";

  version = "2503";

  version = "2503-2";

  src = fetchFromGitHub {

    owner = "paritytech";

    repo = "polkadot-sdk";

    rev = "polkadot-stable${version}";

    hash = "sha256-nPZFmsf82JpBrOrErH5hrEcmieECfgA7JWzEyEh8AAE=";

    hash = "sha256-sUBUWFAJ8PwWUVSqPef0SMJcvSt+bGruTW+GmJGTLdE=";

    # the build process of polkadot requires a .git folder in order to determine

    # the git commit hash that is being built and add it to the version string.

  '';

  useFetchCargoVendor = true;

  cargoHash = "sha256-yOJyvpsEK4Ab/Bh6xmqAEHhj1Rq4u/CevcP7vJi0zxo=";

  cargoHash = "sha256-U3roe7rQL1BaHr3rKV1Dl7Lhjic3pZlxo2DpD9C2ong=";

  buildType = "production";

  buildAndTestSubdir = "polkadot";