feat: remove warning while using pandas iloc in the test files

[quant12345]

This PR removes the warning:

tests/unit/test_pandas/test_correlations.py::test_numeric_auto_equals_spearman
  /home/runner/work/ydata-profiling/ydata-profiling/tests/unit/test_pandas/test_correlations.py:69: FutureWarning: Series.__getitem__ treating keys as positions is deprecated. In a future version, integer keys will always be treated as labels (consistent with DataFrame behavior). To access a value by position, use `ser.iloc[pos]`
    assert auto_result.iloc[0][1] == pytest.approx(spearman_result.iloc[0][1], 0.01)

tests/unit/test_pandas/test_correlations.py::test_categorical_auto_equals_equals_cramers
  /home/runner/work/ydata-profiling/ydata-profiling/tests/unit/test_pandas/test_correlations.py:83: FutureWarning: Series.__getitem__ treating keys as positions is deprecated. In a future version, integer keys will always be treated as labels (consistent with DataFrame behavior). To access a value by position, use `ser.iloc[pos]`
    assert auto_result.iloc[0][1] == pytest.approx(cramers_result.iloc[0][1], 0.01)