Bump govuk-frontend from 5.4.0 to 5.6.0

Bumps [govuk-frontend](https://github.com/alphagov/govuk-frontend) from 5.4.0 to 5.6.0.
- [Release notes](https://github.com/alphagov/govuk-frontend/releases)
- [Changelog](https://github.com/alphagov/govuk-frontend/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk-frontend@v5.4.0...v5.6.0)

---
updated-dependencies:
- dependency-name: govuk-frontend
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

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

package.json

@@ -3,7 +3,7 @@
   "private": "true",
   "dependencies": {
     "esbuild": "^0.21.4",
-    "govuk-frontend": "^5.4.0",
+    "govuk-frontend": "^5.6.0",
     "sass": "^1.75.0"
   },
   "scripts": {

yarn.lock

@@ -205,10 +205,10 @@ glob-parent@~5.1.2:
   dependencies:
     is-glob "^4.0.1"
 
-govuk-frontend@^5.4.0:
-  version "5.4.0"
-  resolved "https://registry.yarnpkg.com/govuk-frontend/-/govuk-frontend-5.4.0.tgz#8f2e0b55ef7c7552a1efe68c7b40ff1b4a393e72"
-  integrity sha512-F3YwQYrYQqIPfNxsoph6O78Ey1unCB6cy6omx8KeWY9G504lWZFBSIaiUCma1jNLw9bOUU7Ui+tXG09jjqy0Mw==
+govuk-frontend@^5.6.0:
+  version "5.6.0"
+  resolved "https://registry.yarnpkg.com/govuk-frontend/-/govuk-frontend-5.6.0.tgz#8c0975f0d825ec7192bcfe64e3e97ef3dfa7dea1"
+  integrity sha512-yNA4bL7i7mNrg36wPNZ3RctHo9mjl82Phs8MWs1lwovxJuQ4ogEo/XWn2uB1HxkXNqgMlW4wnd0iiKgRMfxYfw==
 
 immutable@^4.0.0:
   version "4.3.0"