Bump rubocop-govuk from 4.11.0 to 4.12.0

Bumps [rubocop-govuk](https://github.com/alphagov/rubocop-govuk) from 4.11.0 to 4.12.0.
- [Changelog](https://github.com/alphagov/rubocop-govuk/blob/main/CHANGELOG.md)
- [Commits](alphagov/rubocop-govuk@v4.11.0...v4.12.0)

---
updated-dependencies:
- dependency-name: rubocop-govuk
  dependency-type: direct:development
  update-type: version-update:semver-minor
...

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

Gemfile.lock

@@ -518,15 +518,15 @@ GEM
       rspec-mocks (~> 3.12)
       rspec-support (~> 3.12)
     rspec-support (3.12.0)
-    rubocop (1.53.1)
+    rubocop (1.55.0)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)
       parser (>= 3.2.2.3)
       rainbow (>= 2.2.2, < 4.0)
       regexp_parser (>= 1.8, < 3.0)
       rexml (>= 3.2.5, < 4.0)
-      rubocop-ast (>= 1.28.0, < 2.0)
+      rubocop-ast (>= 1.28.1, < 2.0)
       ruby-progressbar (~> 1.7)
       unicode-display_width (>= 2.4.0, < 3.0)
     rubocop-ast (1.29.0)
@@ -535,8 +535,8 @@ GEM
       rubocop (~> 1.41)
     rubocop-factory_bot (2.23.1)
       rubocop (~> 1.33)
-    rubocop-govuk (4.11.0)
-      rubocop (= 1.53.1)
+    rubocop-govuk (4.12.0)
+      rubocop (= 1.55.0)
       rubocop-ast (= 1.29.0)
       rubocop-rails (= 2.20.2)
       rubocop-rake (= 0.6.0)