message: update test for mariadb
diff: @@ -10,6 +10,7 @@ from .. import read_sql
  @pytest.fixture(scope="module") # type: ignore
  def mysql_url() -> str:
  conn = os.environ["MYSQL_URL"]
  + # conn = os.environ["MARIADB_URL"]
  return conn
  @@ -329,6 +330,8 @@ def test_mysql_types_binary(mysql_url: str) -> None:
  "test_enum": pd.Series(["apple", None, "mango"], dtype="object"),
  "test_json": pd.Series(
  ['{"age":1,"name":"piggy"}', '{"age":2,"name":"kitty"}', None],
  + # mariadb
  + # [b'{"name": "piggy", "age": 1}', b'{"name": "kitty", "age": 2}', None],
  dtype="object",
  ),
  "test_mediumtext": pd.Series(
  @@ -396,6 +399,8 @@ def test_mysql_types_text(mysql_url: str) -> None:
  "test_enum": pd.Series(["apple", None, "mango"], dtype="object"),
  "test_json": pd.Series(
  ['{"age":1,"name":"piggy"}', '{"age":2,"name":"kitty"}', None],
  + # mariadb
  + # [b'{"name": "piggy", "age": 1}', b'{"name": "kitty", "age": 2}', None],
  dtype="object",
  ),
  "test_mediumtext": pd.Series(
  