chore(deps): update dependency @unhead/vue to v1.9.15

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@unhead/vue (source)	1.9.14 -> 1.9.15

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Release Notes

unjs/unhead (@​unhead/vue)

### [`v1.9.15`](https://togithub.com/unjs/unhead/releases/tag/v1.9.15) [Compare Source](https://togithub.com/unjs/unhead/compare/v1.9.14...v1.9.15) *No significant changes* #####     [View changes on GitHub](https://togithub.com/unjs/unhead/compare/v1.9.14...v1.9.15)

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