Merge pull request #172873 from schuelermine/update/flutter-dart

  # Decouples flutter derivation from dart derivation,

  # use specific dart version to not need to bump dart derivation when bumping flutter.

  dartVersion = "2.16.1";

  dartVersion = "2.16.2";

  dartSourceBase = "https://storage.googleapis.com/dart-archive/channels";

  dartForFlutter = dart.override {

    version = dartVersion;

    sources = {

      "${dartVersion}-x86_64-linux" = fetchurl {

        url = "${dartSourceBase}/stable/release/${dartVersion}/sdk/dartsdk-linux-x64-release.zip";

        sha256 = "sha256-PMY6DCFQC8XrlnFzOEPcwgBAs5/cAvNd78969Z+I1Fk=";

        sha256 = "sha256-egrYd7B4XhkBiHPIFE2zopxKtQ58GqlogAKA/UeiXnI=";

      };

    };

  };

in {

  mkFlutter = mkFlutter;

  inherit mkFlutter;

  stable = mkFlutter rec {

    inherit version;

    dart = dartForFlutter;