Bump govuk_design_system_formbuilder from 5.13.0 to 6.0.0

Bumps [govuk_design_system_formbuilder](https://github.com/x-govuk/govuk-form-builder) from 5.13.0 to 6.0.0.
- [Release notes](https://github.com/x-govuk/govuk-form-builder/releases)
- [Commits](x-govuk/govuk-form-builder@v5.13.0...v6.0.0)

---
updated-dependencies:
- dependency-name: govuk_design_system_formbuilder
  dependency-version: 6.0.0
  dependency-type: direct:production
  update-type: version-update:semver-major
...

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

Author: dependabot[bot]

Gemfile

@@ -46,7 +46,7 @@ gem "pg", "~> 1.6"
 
 # For GOV.UK branding
 gem "govuk-components", "~> 6"
-gem "govuk_design_system_formbuilder"
+gem "govuk_design_system_formbuilder", "~> 6"
 
 # Our own custom markdown renderer
 gem "govuk-forms-markdown", github: "alphagov/govuk-forms-markdown", tag: "0.8.0"

Gemfile.lock

@@ -238,7 +238,7 @@ GEM
       html-attributes-utils (~> 1.0.0, >= 1.0.0)
       pagy (>= 6, < 10)
       view_component (>= 4.0, < 4.3)
-    govuk_design_system_formbuilder (5.13.0)
+    govuk_design_system_formbuilder (6.0.0)
       actionview (>= 6.1)
       activemodel (>= 6.1)
       activesupport (>= 6.1)
@@ -758,7 +758,7 @@ DEPENDENCIES
   faker
   govuk-components (~> 6)
   govuk-forms-markdown!
-  govuk_design_system_formbuilder
+  govuk_design_system_formbuilder (~> 6)
   govuk_notify_rails
   i18n-tasks (~> 1.1.2)
   json_schemer
@@ -860,7 +860,7 @@ CHECKSUMS
   googleapis-common-protos-types (1.22.0) sha256=f97492b77bd6da0018c860d5004f512fe7cd165554d7019a8f4df6a56fbfc4c7
   govuk-components (6.0.0) sha256=38feaed165ea2afe4c6f9f68bfcdfdb56426be133d2402912817e21830cbce81
   govuk-forms-markdown (0.8.0)
-  govuk_design_system_formbuilder (5.13.0) sha256=126ff4af70b36f06395e8f4f09d399944bcc10e9a41c2ff7d7773e81e92ca885
+  govuk_design_system_formbuilder (6.0.0) sha256=30025c64e05b71018a48b8618e6e9501efe4bf049d5e127d90e2fd48c0b60ea8
   govuk_notify_rails (3.0.0) sha256=e0e1b8b0a7c47f90963034f290fb2982652aa8051a733c25c178680d44f2d7aa
   hana (1.3.7) sha256=5425db42d651fea08859811c29d20446f16af196308162894db208cac5ce9b0d
   highline (3.1.2) sha256=67cbd34d19f6ef11a7ee1d82ffab5d36dfd5b3be861f450fc1716c7125f4bb4a