Bump vitest from 4.1.5 to 4.1.6

Bumps [vitest](https://github.com/vitest-dev/vitest/tree/HEAD/packages/vitest) from 4.1.5 to 4.1.6.
- [Release notes](https://github.com/vitest-dev/vitest/releases)
- [Commits](https://github.com/vitest-dev/vitest/commits/v4.1.6/packages/vitest)

---
updated-dependencies:
- dependency-name: vitest
  dependency-version: 4.1.6
  dependency-type: direct:development
  update-type: version-update:semver-patch
...

Signed-off-by: dependabot[bot] <support@github.com>

Author: dependabot[bot]

package-lock.json

@@ -34,7 +34,7 @@
     "stylelint-config-gds": "^2.0.0",
     "vite": "^8.0.10",
     "vite-plugin-ruby": "^5.2.2",
-    "vitest": "^4.1.5"
+    "vitest": "^4.1.6"
   },
   "dependencies": {
     "dfe-autocomplete": "github:DFE-Digital/dfe-autocomplete#1d4cc65039e11cc3ba9e7217a719b8128d0e4d53",