Suggestion: resolve test warnings

[oesteban]

Congratulations on the test deployment, I successfully run python -m pip install -r test_requirements.txt and subsequently:

(nipraxis-nme) oesteban@hos65851:~/workspace/nipraxis/diagnostics-NME$ pytest .
======================================================================================================================================================================================================= test session starts ========================================================================================================================================================================================================
platform linux -- Python 3.9.13, pytest-7.2.0, pluggy-1.0.0
rootdir: /data/home/oesteban/workspace/nipraxis/diagnostics-NME, configfile: pytest.ini
collected 3 items                                                                                                                                                                                                                                                                                                                                                                                                                  

findoutlie/tests/test_detectors.py .                                                                                                                                                                                                                                                                                                                                                                                         [ 33%]
findoutlie/tests/test_dvars.py .                                                                                                                                                                                                                                                                                                                                                                                             [ 66%]
findoutlie/tests/test_spm_funcs.py .                                                                                                                                                                                                                                                                                                                                                                                         [100%]

========================================================================================================================================================================================================= warnings summary =========================================================================================================================================================================================================
findoutlie/tests/test_detectors.py::test_iqr_detector
findoutlie/tests/test_detectors.py::test_iqr_detector
  /data/home/oesteban/workspace/nipraxis/diagnostics-NME/findoutlie/detectors.py:121: DeprecationWarning: the `interpolation=` argument to percentile was renamed to `method=`, which has additional options.
  Users of the modes 'nearest', 'lower', 'higher', or 'midpoint' are encouraged to review the method they used. (Deprecated NumPy 1.22)
    Q1 = np.percentile(measures, 25, interpolation="midpoint")

findoutlie/tests/test_detectors.py::test_iqr_detector
findoutlie/tests/test_detectors.py::test_iqr_detector
  /data/home/oesteban/workspace/nipraxis/diagnostics-NME/findoutlie/detectors.py:122: DeprecationWarning: the `interpolation=` argument to percentile was renamed to `method=`, which has additional options.
  Users of the modes 'nearest', 'lower', 'higher', or 'midpoint' are encouraged to review the method they used. (Deprecated NumPy 1.22)
    Q2 = np.percentile(measures, 50, interpolation="midpoint")

findoutlie/tests/test_detectors.py::test_iqr_detector
findoutlie/tests/test_detectors.py::test_iqr_detector
  /data/home/oesteban/workspace/nipraxis/diagnostics-NME/findoutlie/detectors.py:123: DeprecationWarning: the `interpolation=` argument to percentile was renamed to `method=`, which has additional options.
  Users of the modes 'nearest', 'lower', 'higher', or 'midpoint' are encouraged to review the method they used. (Deprecated NumPy 1.22)
    Q3 = np.percentile(measures, 75, interpolation="midpoint")

-- Docs: https://docs.pytest.org/en/stable/how-to/capture-warnings.html
================================================================================================================================================================================================== 3 passed, 6 warnings in 4.40s ===================================================================================================================================================================================================

As you can see, there are three deprecations (all in the same function). Ensuring you address deprecation in time will save maintenance time in the long term.