Update statsmodels due to issue in latest scipy 1.16.0

[stefanDeveloper]

Issue with latest scipy version 1.16.0

As described here statsmodels/statsmodels#9584 , in our project https://github.com/stefanDeveloper/heiDGAF that heavily builds on your library, we run into the same issue.

ImportError: Failed to import test module: inspector.test_inspector
Traceback (most recent call last):
  File "/opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/unittest/loader.py", line 419, in _find_test_path
    module = self._get_module_from_name(name)
             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
  File "/opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/unittest/loader.py", line 362, in _get_module_from_name
    __import__(name)
  File "/home/runner/work/heiDGAF/heiDGAF/tests/inspector/test_inspector.py", line 8, in <module>
    from streamad.model import ZScoreDetector, RShashDetector
  File "/opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/site-packages/streamad/__init__.py", line 12, in <module>
    from . import model
  File "/opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/site-packages/streamad/model/__init__.py", line 13, in <module>
    from .SArima_Detector import SArimaDetector
  File "/opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/site-packages/streamad/model/SArima_Detector.py", line 5, in <module>
    import statsmodels.api as sm
  File "/opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/site-packages/statsmodels/api.py", line 72, in <module>
    from . import datasets, distributions, iolib, regression, robust, tools
  File "/opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/site-packages/statsmodels/distributions/__init__.py", line 4, in <module>
    from .discrete import genpoisson_p, zipoisson, zigenpoisson, zinegbin
  File "/opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/site-packages/statsmodels/distributions/discrete.py", line 4, in <module>
    from scipy._lib._util import _lazywhere
ImportError: cannot import name '_lazywhere' from 'scipy._lib._util' (/opt/hostedtoolcache/Python/3.11.13/x64/lib/python3.11/site-packages/scipy/_lib/_util.py)

[stefanDeveloper]

Just checking in — is there any update on upgrading statsmodels to the latest version?
We’d really appreciate it since we need it in order to support higher Python versions.

[maldwg]

I second this PR, please merge.
@stefanDeveloper thank you for the PR!