Bump @vitest/coverage-v8 from 2.1.6 to 2.1.8 (#763)

Bumps [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8) from 2.1.6 to 2.1.8.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.8/packages/coverage-v8)

---
updated-dependencies:
- dependency-name: "@vitest/coverage-v8"
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

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