Support SciPy 1.12

[kmaehashi]

Tasks

• [ ] Read Release Notes.
• [ ] Fix code and CI to support the new vesrion.
  • FlexCI: Update .pfnci/schema.yaml and .pfnci/matirx.yaml.
  • Update Requirements: For NumPy/SciPy, bump the pinned minimum/maximum version in setup.py (see #4773.)
• [ ] Backport the above PR.
• [ ] For NumPy update, reflect the changes in numpy.array_api to cupy.array_api.
• [ ] Backport the above PR.
• [ ] Fix documentation.
  • Update Requirements section in the Installation Guide (note: the baseline version must be updated only in the development branch).
  • Update docs/requirements.txt to use the latest versions.
• [ ] Backport the above PR.
• [ ] Apply fixes needed to follow the specification changes.

[kmaehashi]

Tests failing against SciPy v1.12.0rc1:

https://ci.preferred.jp/cupy.linux.cuda-head-stable/151407/ https://ci.preferred.jp/cupy.linux.cuda-head/151404/

[asi1024]

https://github.com/cupy/cupy/pull/8127

[kmaehashi]

These tasks seem overlooked? @asi1024

Update Requirements: For NumPy/SciPy, bump the pinned minimum/maximum version in setup.py (see https://github.com/cupy/cupy/issues/4773.) Update docs/requirements.txt to use the latest versions.

[kmaehashi]

These tasks seem overlooked?

Will be done in #8500