build(deps): bump shibuya from 2024.1.17 to 2024.2.21 (#11)

Bumps [shibuya](https://github.com/lepture/shibuya) from 2024.1.17 to 2024.2.21.
- [Release notes](https://github.com/lepture/shibuya/releases)
- [Changelog](https://github.com/lepture/shibuya/blob/master/docs/changelog.rst)
- [Commits](lepture/shibuya@2024.1.17...2024.2.21)

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

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

requirements.txt

@@ -2,7 +2,7 @@ minify-html==0.15.0
 myst-parser==2.0.0
 rcssmin==1.1.2
 rjsmin==1.2.2
-shibuya==2024.1.17
+shibuya==2024.2.21
 sphinx==7.2.6
 sphinx-contributors==0.2.7
 sphinx-copybutton==0.5.2