[Docs Site] Bump vitest from 2.1.5 to 2.1.8 (#18614)

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 2.1.5 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/vitest)

---
updated-dependencies:
- dependency-name: vitest
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Author: dependabot[bot]

package-lock.json

@@ -92,7 +92,7 @@
 		"tsx": "^4.19.2",
 		"typescript": "^5.7.2",
 		"unist-util-visit": "^5.0.0",
-		"vitest": "2.1.5",
+		"vitest": "2.1.8",
 		"wrangler": "^3.87.0",
 		"yaml": "^2.6.1"
 	},