chore(deps-dev): Bump rubocop-govuk (#2387)

Bumps the development-dependencies group with 1 update: [rubocop-govuk](https://github.com/alphagov/rubocop-govuk).


Updates `rubocop-govuk` from `6f00f94` to `b6e4ed5`
- [Commits](alphagov/rubocop-govuk@6f00f94...b6e4ed5)

---
updated-dependencies:
- dependency-name: rubocop-govuk
  dependency-type: direct:development
  dependency-group: development-dependencies
...

Signed-off-by: dependabot[bot] <[email protected]>
Co-authored-by: dependabot[bot] <49699333+dependabot[bot]@users.noreply.github.com>

Gemfile.lock

@@ -1,9 +1,9 @@
 GIT
   remote: https://github.com/alphagov/rubocop-govuk
-  revision: 6f00f9472575aa4f3465a5b2f129c6b0d5f8287b
+  revision: b6e4ed5cb264b4083cd1130cb598c43f619244ee
   specs:
     rubocop-govuk (5.0.2)
-      rubocop (= 1.67.0)
+      rubocop (= 1.68.0)
       rubocop-ast (= 1.33.0)
       rubocop-capybara (= 2.21.0)
       rubocop-rails (= 2.27.0)
@@ -447,7 +447,7 @@ GEM
     rswag-ui (2.15.0)
       actionpack (>= 5.2, < 8.0)
       railties (>= 5.2, < 8.0)
-    rubocop (1.67.0)
+    rubocop (1.68.0)
       json (~> 2.3)
       language_server-protocol (>= 3.17.0)
       parallel (~> 1.10)