Bump govuk_design_system_formbuilder from 4.1.1 to 5.4.0

Bumps [govuk_design_system_formbuilder](https://github.com/x-govuk/govuk-form-builder) from 4.1.1 to 5.4.0.
- [Release notes](https://github.com/x-govuk/govuk-form-builder/releases)
- [Commits](x-govuk/govuk-form-builder@v4.1.1...v5.4.0)

---
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]>

Gemfile.lock

@@ -103,7 +103,7 @@ GEM
       msgpack (~> 1.2)
     brakeman (6.1.2)
       racc
-    builder (3.2.4)
+    builder (3.3.0)
     byebug (11.1.3)
     canonical-rails (0.2.15)
       actionview (>= 4.1, <= 7.2)
@@ -119,7 +119,7 @@ GEM
     coderay (1.1.3)
     coercible (1.0.0)
       descendants_tracker (~> 0.0.1)
-    concurrent-ruby (1.3.1)
+    concurrent-ruby (1.3.3)
     contentful (2.17.0)
       http (> 0.8, < 6.0)
       multi_json (~> 1)
@@ -232,7 +232,7 @@ GEM
       html-attributes-utils (~> 1.0.0, >= 1.0.0)
       pagy (>= 6, < 8)
       view_component (>= 3.9, < 3.12)
-    govuk_design_system_formbuilder (4.1.1)
+    govuk_design_system_formbuilder (5.4.0)
       actionview (>= 6.1)
       activemodel (>= 6.1)
       activesupport (>= 6.1)