auto dependabot: bump the vitest group with 5 updates

Bumps the vitest group with 5 updates:

| Package | From | To |
| --- | --- | --- |
| [@vitest/browser](https://github.com/vitest-dev/vitest/tree/HEAD/packages/browser) | `2.1.5` | `2.1.6` |
| [@vitest/coverage-v8](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-v8) | `2.1.5` | `2.1.6` |
| [@vitest/coverage-istanbul](https://github.com/vitest-dev/vitest/tree/HEAD/packages/coverage-istanbul) | `2.1.5` | `2.1.6` |
| [@vitest/ui](https://github.com/vitest-dev/vitest/tree/HEAD/packages/ui) | `2.1.5` | `2.1.6` |
| [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) | `2.1.5` | `2.1.6` |


Updates `@vitest/browser` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.6/packages/browser)

Updates `@vitest/coverage-v8` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.6/packages/coverage-v8)

Updates `@vitest/coverage-istanbul` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.6/packages/coverage-istanbul)

Updates `@vitest/ui` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.6/packages/ui)

Updates `vitest` from 2.1.5 to 2.1.6
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.6/packages/vitest)

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

Signed-off-by: dependabot[bot] <[email protected]>