v0.996.9

What's Changed

• Bump actions/checkout from 3 to 4 by @dependabot in #99
• add Python 3.12 to the build matrix by @shogo82148 in #100
• use pip wheel instead of python setup.py by @shogo82148 in #101
• use std::function instead of std::binary_function by @shogo82148 in #102
• Prepare for releasing v0.996.9 by @shogo82148 in #103

Full Changelog: v0.996.8...v0.996.9