build(deps): bump gds-api-adapters from 52.7.0 to 52.8.0

Bumps [gds-api-adapters](https://github.com/alphagov/gds-api-adapters) from 52.7.0 to 52.8.0.
- [Release notes](https://github.com/alphagov/gds-api-adapters/releases)
- [Changelog](https://github.com/alphagov/gds-api-adapters/blob/master/CHANGELOG.md)
- [Commits](alphagov/gds-api-adapters@v52.7.0...v52.8.0)

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

Gemfile

@@ -4,7 +4,7 @@ gem 'rails', '~> 5.2'
 gem 'json-schema', '~> 2.8'
 gem 'gds-sso', '~> 13.6'
 gem 'plek', '~> 2.1'
-gem 'gds-api-adapters', '~> 52.7'
+gem 'gds-api-adapters', '~> 52.8'
 gem 'govspeak', '~> 5.6'
 gem 'uuidtools', '~> 2.1'
 gem 'responders', '~> 2.0'

Gemfile.lock

@@ -69,7 +69,7 @@ GEM
     faraday (0.12.2)
       multipart-post (>= 1.2, < 3)
     ffi (1.9.23)
-    gds-api-adapters (52.7.0)
+    gds-api-adapters (52.8.0)
       addressable
       link_header
       lrucache (~> 0.1.1)
@@ -142,9 +142,9 @@ GEM
     marcel (0.3.2)
       mimemagic (~> 0.3.2)
     method_source (0.9.0)
-    mime-types (3.1)
+    mime-types (3.2.2)
       mime-types-data (~> 3.2015)
-    mime-types-data (3.2016.0521)
+    mime-types-data (3.2018.0812)
     mimemagic (0.3.2)
     mini_mime (1.0.0)
     mini_portile2 (2.3.0)
@@ -327,7 +327,7 @@ PLATFORMS
 
 DEPENDENCIES
   ci_reporter_rspec (~> 1.0)
-  gds-api-adapters (~> 52.7)
+  gds-api-adapters (~> 52.8)
   gds-sso (~> 13.6)
   govspeak (~> 5.6)
   govuk-content-schema-test-helpers (~> 1.6)