Bump @storybook/blocks from 8.6.0-alpha.0 to 8.6.12

Bumps [@storybook/blocks](https://github.com/storybookjs/storybook/tree/HEAD/code/lib/blocks) from 8.6.0-alpha.0 to 8.6.12.
- [Release notes](https://github.com/storybookjs/storybook/releases)
- [Changelog](https://github.com/storybookjs/storybook/blob/next/CHANGELOG.md)
- [Commits](https://github.com/storybookjs/storybook/commits/v8.6.12/code/lib/blocks)

---
updated-dependencies:
- dependency-name: "@storybook/blocks"
  dependency-version: 8.6.12
  dependency-type: direct:production
  update-type: version-update:semver-patch
...

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Author: dependabot[bot]