Bump govuk_app_config from 2.4.0 to 2.5.0

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 2.4.0 to 2.5.0.
- [Release notes](https://github.com/alphagov/govuk_app_config/releases)
- [Changelog](https://github.com/alphagov/govuk_app_config/blob/master/CHANGELOG.md)
- [Commits](alphagov/govuk_app_config@v2.4.0...v2.5.0)

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

Gemfile.lock

@@ -99,8 +99,9 @@ GEM
     execjs (2.7.0)
     faker (2.13.0)
       i18n (>= 1.6, < 2)
-    faraday (1.0.1)
+    faraday (1.1.0)
       multipart-post (>= 1.2, < 3)
+      ruby2_keywords
     ffi (1.13.1)
     gds-api-adapters (67.0.1)
       addressable
@@ -111,9 +112,9 @@ GEM
     globalid (0.4.2)
       activesupport (>= 4.2.0)
     govuk_ab_testing (2.4.2)
-    govuk_app_config (2.4.0)
+    govuk_app_config (2.5.0)
       logstasher (>= 1.2.2, < 1.4.0)
-      sentry-raven (>= 2.7.1, < 3.1.0)
+      sentry-raven (~> 3.1.1)
       statsd-ruby (~> 1.4.0)
       unicorn (>= 5.4, < 5.8)
     govuk_publishing_components (21.69.0)
@@ -284,6 +285,7 @@ GEM
     rubocop-rspec (1.42.0)
       rubocop (>= 0.87.0)
     ruby-progressbar (1.10.1)
+    ruby2_keywords (0.0.2)
     rubyzip (2.3.0)
     safe_yaml (1.0.5)
     sass (3.7.4)
@@ -308,7 +310,7 @@ GEM
     selenium-webdriver (3.142.7)
       childprocess (>= 0.5, < 4.0)
       rubyzip (>= 1.2.2)
-    sentry-raven (3.0.4)
+    sentry-raven (3.1.1)
       faraday (>= 1.0)
     simplecov (0.19.0)
       docile (~> 1.1)