Bump govuk_design_system_formbuilder from 5.4.0 to 5.4.1

Bumps [govuk_design_system_formbuilder](https://github.com/x-govuk/govuk-form-builder) from 5.4.0 to 5.4.1.
- [Release notes](https://github.com/x-govuk/govuk-form-builder/releases)
- [Commits](x-govuk/govuk-form-builder@v5.4.0...v5.4.1)

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

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

Author: dependabot[bot]

Gemfile.lock

@@ -146,7 +146,7 @@ GEM
       sentry-rails (~> 5.3)
       sentry-ruby (~> 5.3)
       statsd-ruby (~> 1.5)
-    govuk_design_system_formbuilder (5.4.0)
+    govuk_design_system_formbuilder (5.4.1)
       actionview (>= 6.1)
       activemodel (>= 6.1)
       activesupport (>= 6.1)