Bump vitest from 2.1.5 to 2.1.8

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] <support@github.com>

package.json

@@ -33,7 +33,7 @@
     "stylelint-config-gds": "^2.0.0",
     "vite": "^5.4.11",
     "vite-plugin-ruby": "^5.1.1",
-    "vitest": "^2.1.5"
+    "vitest": "^2.1.8"
   },
   "dependencies": {
     "dfe-autocomplete": "github:DFE-Digital/dfe-autocomplete#8e7389ff62a38bc8880323f6c58eed9c8d10f080",