envoy: 1.30.3 -> 1.30.4

    # However, the version string is more useful for end-users.

    # These are contained in a attrset of their own to make it obvious that

    # people should update both.

    version = "1.30.3";

    rev = "12a6a79966203969a23aa2f0d705f39b679744c2";

    hash = "sha256-S18bnAVha4CnYKHTzytKY6PHWSbOzmObbyZEhzIHsf8=";

    version = "1.30.4";

    rev = "32113313a357829ba3a5dce0795b6780bf8cbf4d";

    hash = "sha256-u9lTVe40pwXTt0YRwJXRuZonS5KJL2JQUQ3L9ymuA74=";

  };

  # these need to be updated for any changes to fetchAttrs