message: fix build only with src_bigquery and dst_arrow2
  before: `cargo build --features "dst_arrow2 src_bigquery"` failed, now
  it works
diff: #[cfg(all(feature = "src_bigquery", feature = "dst_arrow"))]
  mod bigquery_arrow;
  -#[cfg(all(feature = "src_bigquery", feature = "dst_arrow"))]
  +#[cfg(all(feature = "src_bigquery", feature = "dst_arrow2"))]
  mod bigquery_arrow2;
  #[cfg(all(feature = "src_csv", feature = "dst_arrow"))]
  mod csv_arrow;
  @@ -33,7 +33,7 @@ mod sqlite_arrow2;
  #[cfg(all(feature = "src_bigquery", feature = "dst_arrow"))]
  pub use bigquery_arrow::{BigQueryArrowTransport, BigQueryArrowTransportError};
  -#[cfg(all(feature = "src_bigquery", feature = "dst_arrow"))]
  +#[cfg(all(feature = "src_bigquery", feature = "dst_arrow2"))]
  pub use bigquery_arrow2::{BigQueryArrow2Transport, BigQueryArrow2TransportError};
  #[cfg(all(feature = "src_csv", feature = "dst_arrow"))]
  pub use csv_arrow::CSVArrowTransport;
  