fix: add vitest import when extending vitest matchers

[InfiniteXyy]

What: https://github.com/testing-library/jest-dom/issues/645 Fix a vitest typing issue when using global mode

Why: If there is no import of "vitest" in the whole project (for example, vitest is in globalMode), the type merging might not work.

How: By adding an import of "vitest" when extending the matcher type

reference: https://vitest.dev/guide/extending-matchers.html

Checklist:

• [ ] Documentation
• [ ] Tests
• [x] Updated Type Definitions
• [ ] Ready to be merged

[github-actions[bot]]

:tada: This PR is included in version 6.6.3 :tada:

The release is available on:

• npm package (@latest dist-tag)
• GitHub release

Your semantic-release bot :package::rocket:

[gnapse]

@all-contributors please add @InfiniteXyy for code, bug

[allcontributors[bot]]

@gnapse

I've put up a pull request to add @InfiniteXyy! :tada: