Bump govuk_publishing_components from 21.27.1 to 21.28.1

Bumps [govuk_publishing_components](https://github.com/alphagov/govuk_publishing_components) from 21.27.1 to 21.28.1.
- [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@v21.27.1...v21.28.1)

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

Gemfile

@@ -7,7 +7,7 @@ gem "dalli"
 gem "gds-api-adapters", "~> 63.5"
 gem "govuk_ab_testing", "~> 2.4"
 gem "govuk_app_config", "~> 2.0"
-gem "govuk_publishing_components", "~> 21.27.1"
+gem "govuk_publishing_components", "~> 21.28.1"
 gem "htmlentities", "~> 4.3"
 gem "plek", "~> 3.0"
 gem "rack_strip_client_ip", "~> 0.0.2"

Gemfile.lock

@@ -106,14 +106,15 @@ GEM
       sentry-raven (>= 2.7.1, < 2.14.0)
       statsd-ruby (~> 1.4.0)
       unicorn (>= 5.4, < 5.6)
-    govuk_publishing_components (21.27.1)
+    govuk_publishing_components (21.28.1)
       gds-api-adapters
       govuk_app_config
       kramdown
       plek
       rails (>= 5.0.0.1)
       rake
       rouge
+      sass (= 3.7.4)
       sassc-rails (>= 2.0.1)
       sprockets (< 4)
     govuk_schemas (4.0.0)
@@ -247,7 +248,7 @@ GEM
       netrc (~> 0.8)
     rexml (3.2.4)
     robotex (1.0.0)
-    rouge (3.16.0)
+    rouge (3.17.0)
     rubocop (0.80.1)
       jaro_winkler (~> 1.5.1)
       parallel (~> 1.10)
@@ -364,7 +365,7 @@ DEPENDENCIES
   gds-api-adapters (~> 63.5)
   govuk_ab_testing (~> 2.4)
   govuk_app_config (~> 2.0)
-  govuk_publishing_components (~> 21.27.1)
+  govuk_publishing_components (~> 21.28.1)
   govuk_schemas (~> 4.0)
   govuk_test
   htmlentities (~> 4.3)