build(deps): bump govuk-frontend in the frontend group

Bumps the frontend group with 1 update: [govuk-frontend](https://github.com/alphagov/govuk-frontend/tree/HEAD/packages/govuk-frontend).


Updates `govuk-frontend` from 5.14.0 to 6.0.0
- [Release notes](https://github.com/alphagov/govuk-frontend/releases)
- [Changelog](https://github.com/alphagov/govuk-frontend/blob/main/CHANGELOG.md)
- [Commits](https://github.com/alphagov/govuk-frontend/commits/v6.0.0/packages/govuk-frontend)

---
updated-dependencies:
- dependency-name: govuk-frontend
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
  dependency-group: frontend
...

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

Author: dependabot[bot]

bun.lock

@@ -9,7 +9,7 @@
     "@types/rails__request.js": "^0.0.1",
     "accessible-autocomplete": "^3.0.1",
     "ccs-frontend": "^2.5.0",
-    "govuk-frontend": "^5.14.0",
+    "govuk-frontend": "^6.0.0",
     "jquery": "^4.0.0",
     "js-cookie": "^3.0.5",
     "sass": "^1.97.3",