fix(deps): update dependency honox to v0.1.21

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
honox (source)	0.1.20 -> 0.1.21

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Release Notes

honojs/honox (honox)

### [`v0.1.21`](https://togithub.com/honojs/honox/releases/tag/v0.1.21) [Compare Source](https://togithub.com/honojs/honox/compare/v0.1.20...v0.1.21) #### What's Changed - feat: support `.md` by [@​goisaki](https://togithub.com/goisaki) in [https://github.com/honojs/honox/pull/188](https://togithub.com/honojs/honox/pull/188) #### New Contributors - [@​goisaki](https://togithub.com/goisaki) made their first contribution in [https://github.com/honojs/honox/pull/188](https://togithub.com/honojs/honox/pull/188) **Full Changelog**: https://github.com/honojs/honox/compare/v0.1.20...v0.1.21

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