Bump shibuya from 2024.12.20 to 2024.12.21

Bumps [shibuya](https://github.com/lepture/shibuya) from 2024.12.20 to 2024.12.21.
- [Release notes](https://github.com/lepture/shibuya/releases)
- [Changelog](https://github.com/lepture/shibuya/blob/master/docs/changelog.rst)
- [Commits](lepture/shibuya@2024.12.20...2024.12.21)

---
updated-dependencies:
- dependency-name: shibuya
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>