Bump govuk_design_system_formbuilder from 5.3.1 to 5.4.0

Bumps [govuk_design_system_formbuilder](https://github.com/x-govuk/govuk-form-builder) from 5.3.1 to 5.4.0.
- [Release notes](https://github.com/x-govuk/govuk-form-builder/releases)
- [Commits](x-govuk/govuk-form-builder@v5.3.1...v5.4.0)

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

Signed-off-by: dependabot[bot] <[email protected]>

Gemfile.lock

@@ -107,7 +107,7 @@ GEM
     backport (1.2.0)
     base64 (0.2.0)
     benchmark (0.3.0)
-    bigdecimal (3.1.7)
+    bigdecimal (3.1.8)
     bindata (2.4.15)
     bindex (0.8.1)
     bootsnap (1.17.1)
@@ -209,7 +209,7 @@ GEM
       html-attributes-utils (~> 1.0.0, >= 1.0.0)
       pagy (~> 6.0)
       view_component (>= 3.9, < 3.11)
-    govuk_design_system_formbuilder (5.3.1)
+    govuk_design_system_formbuilder (5.4.0)
       actionview (>= 6.1)
       activemodel (>= 6.1)
       activesupport (>= 6.1)
@@ -226,7 +226,7 @@ GEM
     html-attributes-utils (1.0.2)
       activesupport (>= 6.1.4.4)
     httpclient (2.8.3)
-    i18n (1.14.4)
+    i18n (1.14.5)
       concurrent-ruby (~> 1.0)
     io-console (0.7.2)
     irb (1.12.0)
@@ -266,8 +266,8 @@ GEM
     matrix (0.4.2)
     method_source (1.0.0)
     mini_mime (1.1.5)
-    mini_portile2 (2.8.5)
-    minitest (5.22.3)
+    mini_portile2 (2.8.6)
+    minitest (5.23.0)
     msgpack (1.7.2)
     multi_json (1.15.0)
     multi_xml (0.6.0)
@@ -284,7 +284,7 @@ GEM
     net-smtp (0.4.0.1)
       net-protocol
     nio4r (2.7.0)
-    nokogiri (1.16.3)
+    nokogiri (1.16.5)
       mini_portile2 (~> 2.8.2)
       racc (~> 1.4)
     oauth2 (2.0.9)