chore(deps): update storybook monorepo to v7.6.12

[renovate[bot]]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
@storybook/addon-a11y (source)	7.6.11 -> 7.6.12
@storybook/addon-actions (source)	7.6.11 -> 7.6.12
@storybook/addon-essentials (source)	7.6.11 -> 7.6.12
@storybook/addon-links (source)	7.6.11 -> 7.6.12
@storybook/client-api (source)	7.6.11 -> 7.6.12
@storybook/html-vite (source)	7.6.11 -> 7.6.12
storybook (source)	7.6.11 -> 7.6.12

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Release Notes

storybookjs/storybook (@​storybook/addon-a11y)

### [`v7.6.12`](https://togithub.com/storybookjs/storybook/compare/v7.6.11...cebb1a753f7294b12d9149424ddd2660a4cc1b46) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v7.6.11...v7.6.12)

storybookjs/storybook (@​storybook/addon-actions)

### [`v7.6.12`](https://togithub.com/storybookjs/storybook/blob/HEAD/CHANGELOG.md#7612) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v7.6.11...v7.6.12) - CLI: Fix `upgrade` detecting the wrong version of existing Storybooks - [#​25752](https://togithub.com/storybookjs/storybook/pull/25752), thanks [@​JReinhold](https://togithub.com/JReinhold)!

storybookjs/storybook (@​storybook/client-api)

### [`v7.6.12`](https://togithub.com/storybookjs/storybook/compare/v7.6.11...cebb1a753f7294b12d9149424ddd2660a4cc1b46) [Compare Source](https://togithub.com/storybookjs/storybook/compare/v7.6.11...v7.6.12)

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