[Docs Site] Bump vitest from 2.1.8 to 2.1.9 (#19698)

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 2.1.8 to 2.1.9.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v2.1.9/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

@@ -103,7 +103,7 @@
 		"typescript": "5.7.3",
 		"typescript-eslint": "8.20.0",
 		"unist-util-visit": "5.0.0",
-		"vitest": "2.1.8",
+		"vitest": "2.1.9",
 		"wrangler": "3.103.2"
 	},
 	"overrides": {