fix tests for pandas v3

[pbsds]

fixes

============================= test session starts ==============================
platform linux -- Python 3.14.6, pytest-9.0.3, pluggy-1.6.0
rootdir: /build/source
collected 27 items / 8 deselected / 19 selected

tests/test_elements.py ...........                                       [ 57%]
tests/test_io.py .F..                                                    [ 78%]
tests/test_ocr.py .                                                      [ 84%]
tests/test_tools.py ...                                                  [100%]

=================================== FAILURES ===================================
___________________________________ test_csv ___________________________________

    def test_csv():
        i = Interval(1, 2, "y", canvas_height=5)
        r = Rectangle(1, 2, 3, 4)
        q = Quadrilateral(np.arange(8).reshape(4, 2), 200, 400)
        l = Layout([i, r, q], page_data={"width": 200, "height": 200})

>       _l = load_csv("tests/fixtures/io/layout.csv")
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

tests/test_io.py:58:
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _
/lib/python3.14/site-packages/layoutparser/io/basic.py:110: in load_csv
    return load_dataframe(pd.read_csv(filename), block_type=block_type)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/lib/python3.14/site-packages/layoutparser/io/basic.py:148: in load_dataframe
    return load_dict(df.apply(lambda x: x.dropna().to_dict(), axis=1).to_list())
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/lib/python3.14/site-packages/layoutparser/io/basic.py:86: in load_dict
    return Layout([load_dict(ele) for ele in data])
                   ^^^^^^^^^^^^^^
/lib/python3.14/site-packages/layoutparser/io/basic.py:83: in load_dict
    return BASECOORD_ELEMENT_NAMEMAP[data["block_type"]].from_dict(data)
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
/lib/python3.14/site-packages/layoutparser/elements/base.py:274: in from_dict
    return cls(**{f: data[f] for f in cls._features})
           ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
_ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _ _

self = <[AttributeError("'Quadrilateral' object has no attribute '_points'") raised in repr()] Quadrilateral object at 0x7fffbebba450>
points = '[0, 1, 2, 3, 4, 5, 6, 7]', height = 200.0, width = 400.0

    def __init__(
        self, points: Union[np.ndarray, List, List[List]], height=None, width=None
    ):

        if isinstance(points, np.ndarray):
            if points.shape != (4, 2):
                raise ValueError(f"Invalid points shape: {points.shape}.")
        elif isinstance(points, list):
            if len(points) == 8:
                points = np.array(points).reshape(4, 2)
            elif len(points) == 4 and isinstance(points[0], list):
                points = np.array(points)
            else:
                raise ValueError(
                    f"Invalid number of points element {len(points)}. Should be 8."
                )
        else:
>           raise ValueError(
                f"Invalid input type for points {type(points)}."
                "Please make sure it is a list of np.ndarray."
            )
E           ValueError: Invalid input type for points <class 'str'>.Please make sure it is a list of np.ndarray.

/lib/python3.14/site-packages/layoutparser/elements/layout_elements.py:829: ValueError

this may not be a full pandas v3 migration, but it fixes the tests