fix(deps): update dependency pinia to v2.1.6

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
pinia	2.1.4 -> 2.1.6

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Release Notes

vuejs/pinia (pinia)

### [`v2.1.6`](https://togithub.com/vuejs/pinia/releases/tag/pinia%402.1.6) [Compare Source](https://togithub.com/vuejs/pinia/compare/pinia@2.1.5...pinia@2.1.6) Please refer to [CHANGELOG.md](https://togithub.com/vuejs/pinia/blob/v2/packages/pinia/CHANGELOG.md) for details. ### [`v2.1.5`](https://togithub.com/vuejs/pinia/releases/tag/pinia%402.1.5) [Compare Source](https://togithub.com/vuejs/pinia/compare/pinia@2.1.4...pinia@2.1.5) Please refer to [CHANGELOG.md](https://togithub.com/vuejs/pinia/blob/v2/packages/pinia/CHANGELOG.md) for details.

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