Bump govuk_design_system_formbuilder from 3.1.2 to 3.2.0

Bumps [govuk_design_system_formbuilder](https://github.com/DFE-Digital/govuk-formbuilder) from 3.1.2 to 3.2.0.
- [Release notes](https://github.com/DFE-Digital/govuk-formbuilder/releases)
- [Commits](x-govuk/govuk-form-builder@v3.1.2...v3.2.0)

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

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

Gemfile.lock

@@ -167,7 +167,7 @@ GEM
       sentry-ruby (~> 5.3)
       statsd-ruby (~> 1.5)
       unicorn (~> 6.1)
-    govuk_design_system_formbuilder (3.1.2)
+    govuk_design_system_formbuilder (3.2.0)
       actionview (>= 6.1)
       activemodel (>= 6.1)
       activesupport (>= 6.1)