Bump govuk_publishing_components from 5.7.0 to 6.0.0

Bumps [govuk_publishing_components](https://github.com/alphagov/govuk_publishing_components) from 5.7.0 to 6.0.0.
- [Release notes](https://github.com/alphagov/govuk_publishing_components/releases)
- [Changelog](https://github.com/alphagov/govuk_publishing_components/blob/master/CHANGELOG.md)
- [Commits](alphagov/govuk_publishing_components@v5.7.0...v6.0.0)

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

Gemfile

@@ -17,7 +17,7 @@ gem 'gds-api-adapters', '~> 52.2'
 gem 'govuk_ab_testing', '~> 2.4'
 gem 'govuk_app_config', '~> 1.3'
 gem 'govuk_frontend_toolkit', '~> 7.4'
-gem 'govuk_publishing_components', '~> 5.7.0'
+gem 'govuk_publishing_components', '~> 6.0.0'
 gem 'plek', '~> 2.1'
 gem 'slimmer', '~> 12.0'
 

Gemfile.lock

@@ -123,14 +123,10 @@ GEM
     govuk_frontend_toolkit (7.4.2)
       railties (>= 3.1.0)
       sass (>= 3.2.0)
-    govuk_navigation_helpers (9.2.1)
-      activesupport (~> 5.1)
-      gds-api-adapters (>= 43.0)
-      govuk_ab_testing (~> 2.4)
-    govuk_publishing_components (5.7.0)
+    govuk_publishing_components (6.0.0)
       govspeak (>= 5.0.3)
+      govuk_app_config
       govuk_frontend_toolkit
-      govuk_navigation_helpers (~> 9.2.1)
       rails (>= 5.0.0.1)
       rake
       rouge
@@ -213,7 +209,7 @@ GEM
     rack (2.0.4)
     rack-cache (1.7.1)
       rack (>= 0.4)
-    rack-test (0.8.3)
+    rack-test (1.0.0)
       rack (>= 1.0, < 3)
     rack_strip_client_ip (0.0.2)
     rails (5.1.5)
@@ -365,7 +361,7 @@ DEPENDENCIES
   govuk_ab_testing (~> 2.4)
   govuk_app_config (~> 1.3)
   govuk_frontend_toolkit (~> 7.4)
-  govuk_publishing_components (~> 5.7.0)
+  govuk_publishing_components (~> 6.0.0)
   govuk_schemas (~> 3.1)
   htmlentities (~> 4.3)
   jasmine-rails