Bump govuk_admin_template from 6.11.0 to 7.0.0

Bumps [govuk_admin_template](https://github.com/alphagov/govuk_admin_template) from 6.11.0 to 7.0.0.
- [Changelog](https://github.com/alphagov/govuk_admin_template/blob/main/CHANGELOG.md)
- [Commits](alphagov/govuk_admin_template@v6.11.0...v7.0.0)

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

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

Gemfile.lock

@@ -90,7 +90,7 @@ GEM
     brakeman (6.1.2)
       racc
     bson (5.0.0)
-    builder (3.2.4)
+    builder (3.3.0)
     byebug (11.1.3)
     cancancan (3.6.1)
     capybara (3.40.0)
@@ -180,7 +180,7 @@ GEM
       nokogiri (~> 1.12)
       rinku (~> 2.0)
       sanitize (~> 6)
-    govuk_admin_template (6.11.0)
+    govuk_admin_template (7.0.0)
       bootstrap-sass (~> 3.4)
       jquery-rails (~> 4.3)
       plek (>= 2.1)