message: Apparently pd.NA is not present on all versions of Pandas
diff: @@ -6,10 +6,10 @@ import duckdb
  class TestPandasObjectInteger(object):
  def test_object_integer(self, duckdb_cursor):
  df_in = pd.DataFrame({
  - 'int8': pd.Series([pd.NA, 1, -1], dtype="Int8"),
  - 'int16': pd.Series([pd.NA, 1, -1], dtype="Int16"),
  - 'int32': pd.Series([pd.NA, 1, -1], dtype="Int32"),
  - 'int64': pd.Series([pd.NA, 1, -1], dtype="Int64")}
  + 'int8': pd.Series([None, 1, -1], dtype="Int8"),
  + 'int16': pd.Series([None, 1, -1], dtype="Int16"),
  + 'int32': pd.Series([None, 1, -1], dtype="Int32"),
  + 'int64': pd.Series([None, 1, -1], dtype="Int64")}
  )
  df_expected_res = pd.DataFrame({
  'int8': np.ma.masked_array([0,1,-1], mask=[True,False,False], dtype='float64'),
  