chore(deps): bump shibuya from 2024.7.13 to 2024.8.21

Bumps [shibuya](https://github.com/lepture/shibuya) from 2024.7.13 to 2024.8.21.
- [Release notes](https://github.com/lepture/shibuya/releases)
- [Changelog](https://github.com/lepture/shibuya/blob/master/docs/changelog.rst)
- [Commits](lepture/shibuya@2024.7.13...2024.8.21)

---
updated-dependencies:
- dependency-name: shibuya
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

requirements.txt

@@ -2,7 +2,7 @@ minify-html==0.15.0
 myst-parser==4.0.0
 rcssmin==1.1.2
 rjsmin==1.2.2
-shibuya==2024.7.13
+shibuya==2024.8.21
 sphinx==8.0.2
 sphinx-contributors==0.2.7
 sphinx-copybutton==0.5.2