gensim is failing to start tests using scipy 1.13 from experimental,
apparently due to use of a decprecated API.

Error is

278s _______________ ERROR collecting gensim/test/test_aggregation.py _______________
278s ImportError while importing test module '/tmp/autopkgtest-lxc.ikaecbc1/downtmp/autopkgtest_tmp/gensim/test/test_aggregation.py'.
278s Hint: make sure your test modules/packages have valid Python names.
278s Traceback:
278s /usr/lib/python3.12/importlib/__init__.py:90: in import_module
278s     return _bootstrap._gcd_import(name[level:], package, level)
278s gensim/test/test_aggregation.py:14: in <module>
278s     from gensim.topic_coherence import aggregation
278s /usr/lib/python3/dist-packages/gensim/__init__.py:11: in <module>
278s     from gensim import parsing, corpora, matutils, interfaces, models, similarities, utils  # noqa:F401
278s /usr/lib/python3/dist-packages/gensim/corpora/__init__.py:6: in <module>
278s     from .indexedcorpus import IndexedCorpus  # noqa:F401 must appear before the other classes
278s /usr/lib/python3/dist-packages/gensim/corpora/indexedcorpus.py:14: in <module>
278s     from gensim import interfaces, utils
278s /usr/lib/python3/dist-packages/gensim/interfaces.py:19: in <module>
278s     from gensim import utils, matutils
278s /usr/lib/python3/dist-packages/gensim/matutils.py:20: in <module>
278s     from scipy.linalg import get_blas_funcs, triu
278s E   ImportError: cannot import name 'triu' from 'scipy.linalg' (/usr/lib/python3/dist-packages/scipy/linalg/__init__.py)

Full test log at https://ci.debian.net/packages/g/gensim/unstable/amd64/47741137/

We've only just made scipy 1.12 available, but upstream is already
preparing the 1.14 release, so we'll want to push scipy 1.13 (and
1.14) to unstable in the near future.