Bump govuk_publishing_components from 21.15.1 to 21.15.2

Bumps [govuk_publishing_components](https://github.com/alphagov/govuk_publishing_components) from 21.15.1 to 21.15.2.
- [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@v21.15.1...v21.15.2)

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

Gemfile

@@ -7,7 +7,7 @@ gem "dalli"
 gem "gds-api-adapters", "~> 63.1"
 gem "govuk_ab_testing", "~> 2.4"
 gem "govuk_app_config", "~> 2.0"
-gem "govuk_publishing_components", "~> 21.15.1"
+gem "govuk_publishing_components", "~> 21.15.2"
 gem "htmlentities", "~> 4.3"
 gem "plek", "~> 3.0"
 gem "rack_strip_client_ip", "~> 0.0.2"

Gemfile.lock

@@ -106,7 +106,7 @@ GEM
       sentry-raven (>= 2.7.1, < 2.12.0)
       statsd-ruby (~> 1.4.0)
       unicorn (>= 5.4, < 5.6)
-    govuk_publishing_components (21.15.1)
+    govuk_publishing_components (21.15.2)
       gds-api-adapters
       govuk_app_config
       kramdown
@@ -321,7 +321,7 @@ GEM
       unf_ext
     unf_ext (0.0.7.6)
     unicode-display_width (1.6.0)
-    unicorn (5.5.1)
+    unicorn (5.5.2)
       kgio (~> 2.6)
       raindrops (~> 0.7)
     webdrivers (4.1.3)
@@ -362,7 +362,7 @@ DEPENDENCIES
   gds-api-adapters (~> 63.1)
   govuk_ab_testing (~> 2.4)
   govuk_app_config (~> 2.0)
-  govuk_publishing_components (~> 21.15.1)
+  govuk_publishing_components (~> 21.15.2)
   govuk_schemas (~> 4.0)
   govuk_test
   htmlentities (~> 4.3)