Bump govuk_design_system_formbuilder from 4.1.1 to 5.0.0 (#1003)

Bumps [govuk_design_system_formbuilder](https://github.com/x-govuk/govuk-form-builder) from 4.1.1 to 5.0.0.
- [Release notes](https://github.com/x-govuk/govuk-form-builder/releases)
- [Commits](x-govuk/govuk-form-builder@v4.1.1...v5.0.0)

---
updated-dependencies:
- dependency-name: govuk_design_system_formbuilder
  dependency-type: direct:production
  update-type: version-update:semver-major
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -233,7 +233,7 @@ GEM
       html-attributes-utils (~> 1.0.0, >= 1.0.0)
       pagy (~> 6.0)
       view_component (>= 3.3, < 3.7)
-    govuk_design_system_formbuilder (4.1.1)
+    govuk_design_system_formbuilder (5.0.0)
       actionview (>= 6.1)
       activemodel (>= 6.1)
       activesupport (>= 6.1)