Bump govuk_app_config from 1.5.1 to 1.6.0

Bumps [govuk_app_config](https://github.com/alphagov/govuk_app_config) from 1.5.1 to 1.6.0.
- [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@v1.5.1...v1.6.0)

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

Author: dependabot-support

Gemfile

@@ -15,7 +15,7 @@ gem 'uglifier', '>= 1.3.0'
 
 gem 'gds-api-adapters', '~> 52.6'
 gem 'govuk_ab_testing', '~> 2.4'
-gem 'govuk_app_config', '~> 1.5'
+gem 'govuk_app_config', '~> 1.6'
 gem 'govuk_frontend_toolkit', '~> 7.4'
 gem 'govuk_publishing_components', '~> 9.3.6'
 gem 'plek', '~> 2.1'

Gemfile.lock

@@ -119,7 +119,7 @@ GEM
       rubocop-rspec (~> 1.19.0)
       scss_lint
     govuk_ab_testing (2.4.1)
-    govuk_app_config (1.5.1)
+    govuk_app_config (1.6.0)
       logstasher (~> 1.2.2)
       sentry-raven (~> 2.7.1)
       statsd-ruby (~> 1.4.0)
@@ -366,7 +366,7 @@ DEPENDENCIES
   gds-api-adapters (~> 52.6)
   govuk-lint
   govuk_ab_testing (~> 2.4)
-  govuk_app_config (~> 1.5)
+  govuk_app_config (~> 1.6)
   govuk_frontend_toolkit (~> 7.4)
   govuk_publishing_components (~> 9.3.6)
   govuk_schemas (~> 3.1)